Grade 11 Students’ Reflections on their Euclidean Geometry Learning Experiences

The teaching of Euclidean geometry is a matter of serious concern in South Africa. This research, therefore, examined the Euclidean geometry learning experiences of 16 Grade 11 students from four South African secondary schools. Data were obtained using focus group discussions and student diary records. Students who were taught using a Van Hiele theory-based approach reported positive learning experiences in Euclidean geometry, while those who were taught using conventional methods reported negative learning experiences. It was concluded that the Van Hiele theory-based approach seems to meet students’ needs better than conventional approaches in learning Euclidean geometry. The use of unconventional teaching approaches such as Van Hiele theory-based instruction in the teaching and learning of Euclidean geometry is therefore recommended. Furthermore, teachers should give students an opportunity to evaluate the teaching approaches used in mathematics classrooms. Student input will help teachers change their teaching methods to suit the needs of the students.

In South Africa, Euclidean geometry was removed from the mainstream mathematics curriculum in 2006, after a series of poor results in the Grade 12 Mathematics examinations. It was alleged that teachers did not have the required depth of content and pedagogical knowledge to effectively teach Euclidean geometry (Bowie, 2009). In January 2012, South Africa reinstated Euclidean geometry in a new Curriculum and Assessment Policy Statement (CAPS). The decision to bring Euclidean geometry back into the mainstream mathematics curriculum came after numerous studies concluded that university students who had not done Euclidean geometry at high school were weaker in their mathematical skills compared to their counterparts who had a geometry background (see Engelbecht, Harding, & Phiri, 2010;Mouton, Louw, & Strydom, 2012;Padayachee, Boshoff, Olivier, & Harding, 2011;Wolmarans, Smit, Collier-Reed, & Leather, 2010).
While the return of Euclidean geometry was applauded by South African universities, it brought anxiety for both the educators and the learners (Govender, 2014). South African mathematics educators 2 / 19 wonder why Euclidean geometry was brought back into the mainstream mathematics curriculum when the challenges that led to its exclusion in the previous mathematics curriculum have not been fully addressed (Ndlovu, 2013). The situation is aggravated by the fact that some of the educators who are expected to teach Euclidean geometry in the Curriculum and Assessment Policy Statement (CAPS) have no previous contact with the topic (Govender, 2014). In an attempt to address some of the educators' concerns, the South African Department of Basic Education (DBE) rolled out a programme to train educators across all provinces in the country, on the new mathematics content that came with the CAPS. This included Euclidean geometry, Probability and Statistical regression. While the training of educators on the CAPS content has gone a long way in upgrading in-service educators' knowledge of Euclidean geometry, not all of the educators' concerns have been fully addressed (Ndlovu, 2013).
In a follow up survey that explored South African mathematics educators' views on the CAPS training they received in 2012, most educators concurred that the training was inadequate for them to teach Euclidean geometry with confidence (Olivier, 2013(Olivier, , 2014. Of the 150 educators who participated in the survey, 60% indicated that they were not comfortable with Euclidean geometry (Olivier, 2014). Dube (2016), added that in some instances, the CAPS training facilitators themselves seemed to lack adequate knowledge and skills needed to help educators to improve. From this background, it is clear that there is urgent need to find ways to help teachers improve their teaching of Euclidean geometry in schools.

LITERATURE REVIEW
Euclidean geometry is the study of plane and solid shapes and their properties based on the theorems and axioms developed by the Greek mathematician Euclid. It involves proving riders using theorems and axioms. A rider is simply a non-routine geometry problem. Proving riders is an abstract process that many students find difficult to understand. Many teachers lack the pedagogical knowledge of how to teach proof and reasoning (Mudaly, 2016), and this is the main reason why many students have difficulties with geometric proofs (Bramlet & Drake, 2013;Mwadzaangati, 2015).

Conventional Approaches to Teaching Euclidean Theorems and Proofs
The difficulties of students with geometric proofs are primarily due to the continued use of the traditional teacher-centred approaches (Abdullah & Zakaria, 2013;Siyepu, 2014). Teachers have the habit of teaching in the same way that they themselves were taught (Keiler, 2018). The dominant approach in many geometry classrooms is that: teachers copy theorems and proofs onto the chalkboard followed by teacher lecture; students in turn, copy theorems and proofs into their notebooks; students memorize theorems and proofs and reproduce them in class exercises, tests and examinations without understanding (De Villiers & Heideman, 2014). Students are treated as "mere receptors of mathematical facts, principles, formulas and theorems" which are not to be challenged (Armah, Cofie, & Okpoti, 2018, p. 314). This is the traditional way of teaching Euclidean theorems and proofs.
Teachers who employ the traditional methods do not bother to check whether students have mastered the basic geometry concepts from lower grades. They just move straight into the geometry concepts of the current grade. Students are not given an opportunity to investigate, observe and discover geometry theorems and axioms for themselves. Proofs are presented as rigid and ready-made ideas to be accepted without questions. The teacher and the textbook are the only sources of geometry knowledge and students who fail to understand the explanations presented by these two sources are regarded as unable to learn geometry.
The use of traditional teacher-centred methods in teaching Euclidean geometry was found to be less effective than student-centred methods (see for example, Mensah-Wonkyi & Adu, 2016;Yılmazer & Keklikci, 2015). However, despite several reports suggesting that the use of traditional methods is not effective in teaching Euclidean geometry, teachers may continue to use these methods for a number of reasons. In South Africa, there are many teachers in schools who did not do Euclidean geometry at high school, college or university who are

Contribution to the literature
• This study explored the impact of Van Hiele theory-based instruction on the learning of Euclidean geometry using QUALITATIVE methods. • This research shows that Van Hiele theory-based instruction has a positive impact on students' attitudes, self-confidence, feelings and emotions, which all contribute to the student's overall academic performance. • The findings of this research demonstrate the importance of giving students an opportunity to evaluate the efficacy of teaching approaches used by mathematics teachers at high school level. This was missing in previous studies on the impact of using Van Hiele theory-based instruction in teaching and learning Euclidean geometry.
expected to teach the topic in the CAPS (Govender, 2014). Besides not having adequate knowledge of Euclidean geometry content, the teachers lack the pedagogical content knowledge (PCK) for effective geometry instruction. This explains why in a survey conducted by Olivier (2014), many teachers reported that they were not comfortable with the topic, and that the training they had received was not enough to prepare them for the challenges of the classroom.
Unless these teachers are empowered with alternative methods for teaching Euclidean geometry, they are likely to continue to teach the topic in the conventional way.

Van Hiele Theory-based Approach to Teaching Euclidean Theorems and Proofs
The Van Hiele theory offers comprehensive guidelines for geometry instruction (see Van Hiele-Geldof, 1984). The theory defines the hierarchical levels of progression in learning geometry (visualization, analysis, informal deduction, formal deduction, and rigor), and suggests a sequence of activities for organizing geometry instruction at the various levels to enhance students' understanding of geometry concepts. These are: information, guided orientation, explicitation, free orientation, and integration.
According to the Van Hiele theory, students cannot master level ( ) if they have not mastered level ( − 1). The Van Hieles use this property to explain why, on the one hand, many teachers fail to reach their students in geometry, and on the other hand, many students struggle to understand geometry concepts. It is because of the mismatch between the level of instruction and the students' current levels of mastery of geometry concepts. By adjusting the level of instruction down to the level of understanding of the students, teachers can actually make Euclidean geometry concepts accessible to the majority of their students.
Many studies have tested the efficacy of Van Hiele theory-based instruction on students' performance in Euclidean geometry using quasi-experiments (see for example, Baiduri, Ismail, & Sulfiyah, 2020;Mostafa, Javad, & Reza, 2017;Tahani, 2016;Usman, Yew, & Saleh, 2019). The apparent convergence of findings from these studies is that Van Hiele theory-based instruction is more effective in improving student achievement in Euclidean geometry compared to traditional methods. Previous research, however, evaluated the efficacy of Van Hiele theory-based instruction on student performance using only quantitative methods (such as pre-test/post-test designs) and statistical analyses. Students have not been given the opportunity to share their thoughts on the proposed educational interventions. Experiments with human beings are different from laboratory experiments with non-living objects. Human beings have thoughts, attitudes, feelings and emotions that have the ability to affect the outcomes of the proposed educational interventions. Therefore, student's voice matters.
A view of the present study is that: students' reflections on their Euclidean geometry learning experiences could provide teachers with valuable insights on what they should do or should avoid in order to meet the needs of their students when teaching Euclidean theorems and proofs in secondary schools.

THEORETICAL FRAMEWORK
Students' reflections in the context of this study refers to students' views, feelings, and attitudes towards their learning experiences in the mathematics classroom. According to the United Nations Convention on the Rights of the Child (UNCRC), children have a right to express their views and thoughts on matters concerning their lives (Abrahams & Matthews, 2011). That includes views on what and how they learn in schools. In a democratic society, the right to be heard is a basic human right (Cato, 2018). Research indicates that giving students an opportunity to reflect on their learning experiences has several benefits for education leaders, teachers and the students themselves (Rennie Center for Education Research and Policy, 2019).
Students whose voices are listened to and whose contributions are incorporated into the school curricula, develop a sense of ownership of their learning and development in schools (Department of Education and Training, 2018). They are likely to have high self-efficacy and increased motivation levels (Wang, 2013), which eventually lead to better student achievement (Bonnie & Lawes, 2016;Dell EMC, 2018). Students are expert observers of teachers, how they teach and what goes on in schools (Busher, 2012). They are in the best position to evaluate educational programmes compared to other stakeholders (Bill & Giles, 2016). Students can provide valuable information on the strengths and weaknesses, successes and failures of educational initiatives (Rennie Center for Education Research and Policy, 2019). Such information can be used by teachers to review and revise their teaching to suit the interests and needs of the students.
The foregoing ideas form the foundation upon which the present study was grounded. With numerous reports suggesting that the teaching of Euclidean geometry in secondary schools is problematic (see for example, Mukamba & Makamure, 2020;Naidoo & Kapofu, 2020;Ngirishi & Bansilal, 2019;Oueini, 2019;Tachie, 2020), the student voice is pivotal in diagnosing the essence of the problem and finding new approaches to improve the teaching and learning of the topic (Department of Education and Training, 2018). Studies based on quantitative data analysis alone are not enough. Thus, the collection, analysis and interpretation of qualitative 4 / 19 data is therefore essential to augment quantitative data findings.

THE PURPOSE OF THE STUDY
This research is a follow up to a quasi-experiment that tested the effect of Van Hiele theory-based instruction on Grade 11 students' geometric proof competencies. Quasi-experiment findings showed that students who were taught using the Van Hiele theorybased approach obtained better geometric proof competencies than students who were taught using traditional approaches (Machisi & Feza, in press). The purpose of this study is to provide a platform for students who participated in the quasi-experiment to present their views, feelings and attitudes towards Euclidean geometry on the basis of their learning experiences. Student feedback is used to suggest ways to strengthen the teaching and learning of Euclidean theorems and proofs in classrooms where students and teachers have difficulties with geometry.

METHODOLOGY
The researcher used the qualitative research methodology to elicit students' views, feelings and attitudes towards educators' approaches to teaching Euclidean geometry theorems and proofs in secondary schools.

Participants and Context
This research is a follow up to a quasi-experiment involving 186 Grade 11 students from four conveniently selected township schools in the Capricorn District of Limpopo province, South Africa. The schools were coded C1, C2, E1 and E2. Schools C1 and C2 from Mankweng township formed the control group whereas the other two schools (E1 & E2) from Seshego township formed the experimental group. Schools were chosen on the basis of their similarity in enrolment, school infrastructure, past school mathematics performance, location, and socio-economic status of communities surrounding the schools.
Of the 186 Grade 11 students who took part in the quasi-experiment, 16 students volunteered to participate in the follow up study. Nine of these were from the control group schools (3 students from school C1 and 6 students from school C2) and the remaining seven came from the experimental schools (3 students from school E1 and 4 students from school E2). Self-selection, a type of convenience sampling method in which participants volunteer to take part in the study, was used to recruit the students. It was presumed that self-selected participants have a greater commitment and willingness to participate in the study than those recruited by persuasion. White (2006) asserts that selfselected individuals "will be highly motivated and have strong opinions on the topic" (p. 188). Participants were informed that students and schools' actual names will not be used in reporting the research findings. Students' actual names were thus replaced by pseudonyms.
In the quasi-experiment, the control group students were taught by their teachers using their usual approaches whereas the experimental group students were taught by the teacher-researcher using a model of instruction designed based on the Van Hiele theory. The Van Hiele theory-based model of instruction included first assessing students' prior geometry knowledge to determine their current level of geometric understanding. This was followed by remedial lessons to bridge the identified learning gaps, in keeping with the Van Hiele theory which states that students should not be introduced to level ( ) if they have not yet mastered level ( − 1). Grade 11 Euclidean geometry was then taught following the sequence of teaching and learning activities suggested by the Van Hieles: Information, Guided orientation, Explicitation, Free orientation, and Integration. In the Information phase, students were exposed to a brief history of Euclidean geometry, why it should be taught in secondary schools, and its role in real life. Guided exploration involved exploring theorems and axioms using the Geometer's Sketchpad. Explicitation involved explaining what they had discovered in the guided exploration phase. Free orientation involved applying theorems and axioms to solving non-routine geometry problems with no interference from the teacher. In the Integration phase, students shared their solutions to geometry problems in a whole class discussion. The full details of how the Van Hiele model was implemented in teaching Euclidean theorems and proofs are reported in our manuscript entitled "Van Hiele Theory-Based Instruction and Grade 11 Students' Geometric Proof Competencies" which has been accepted for publication in the Contemporary Mathematics and Science Education journal.
The experimental and control groups were taught the same Euclidean geometry concepts for a period of four weeks. Using a pre-test/post-test design, experimental group students performed significantly better than control group students, after controlling for covariates (see Machisi & Feza, in press). This study explores these findings further.

Data collection instruments
Data were collected using diaries and focus group discussions. The diary method was chosen because it captures data at or shortly after the time of occurrence of the event (Woll, 2013) and has less recall errors compared to questionnaires that capture events long after they have occurred (Sheble & Wildemuth, 2009). In education, students' diaries provide valuable feedback that teachers can use to plan future lessons (Yi, 2008).
A diary guide was developed by the researcher using guidelines from available literature. The first part of the diary guide explained the purpose of the diary as suggested by Duke (2012) and Rausch (2014). Second, issues of anonymity and confidentiality were addressed to gain the trust of the participants. Third, clear written instructions were given on the variables of interest that the diarists should write about (Bytheway, 2012;Rausch, 2014) and when the diary entries should be recorded. These included: a description of how the geometry lesson was presented; thoughts, feelings and emotions about the presentation; favourable and unfavourable teaching practices; and a description of own attitude towards learning Euclidean geometry. Providing information on the variables of interest was essential to relieve diarists of the burden of deciding what to include in the diary. There were no restrictions on the amount of information students/diarists could write per each variable of interest. Each diary was a small portable notebook made up of 192 pages. Daily entries were allowed to overflow to the next page when necessary.
While diaries are a valuable data collection tool, they should not be used in isolation (Woll, 2013). Instead, they should be used in conjunction with other data collection methods such as interviews in order to enrich findings or as a form of triangulation (Sheble & Wildemuth, 2009). For this reason, focus group discussions were used to augment the diary method.
A focus group is a carefully planned discussion, in which a small group of participants are brought together by a trained facilitator to generate qualitative data on a topic of interest. Focus groups are ideal for exploring people's experiences, attitudes, perceptions, beliefs, opinions and ideas on a given topic (Dilshad & Latif, 2013;Knight, 2012;Pearson & Vossler, 2016). This was exactly the intention of this research. Such information would help teachers to design, redesign and refine their teaching for better student achievement. Focus groups are also relatively cheap compared to individual interviews and allow the researcher to collect a lot of information in a short period of time (Baral, Uprety, & Lamichhane, 2016).
A focus group discussion guide was developed by the researcher following the recommendations by Krueger (2002) and Kuhn (2016) of what a typical focus group interview guide should contain. It was made up of the Preliminary Section, the Opening Section, the Question Section, and the Closing Section. The critical part of the discussion guide was the Question Section, which included three categories of time-framed questions: engagement questions, exploration questions, and the closing questions. A preliminary list of ten questions was developed and sent to experts for review. The experts' feedback and comments led to three questions being removed from the list. The remaining seven questions (one for engagement, five for exploration, and one for closing) were then entered into a draft discussion guide. The draft discussion guide was pilot-tested on a sample of students who were not part of the study. This resulted in some questions being revised to enhance clarity. A final draft of the discussion guide was thus developed. The five questions used to explore the variables of interest were:  What do you think about the way Euclidean geometry and geometry proofs were taught in your mathematics classroom?  How do you feel about the way Euclidean geometry and geometry proofs were taught in your mathematics classroom?  What do you like or dislike about the way Euclidean geometry and geometry proofs were taught in your mathematics classroom?  Can you describe your attitude towards Euclidean geometry and geometry proofs based on your learning experiences?  What did the teacher do that you think contributed to your attitude towards Euclidean geometry and geometry proofs?
The purpose of the focus group discussion guide was to ensure that all important areas of the study were addressed (Reid & Mash, 2014). It also helped the focus group moderator to stay on track during discussions.

Data Collection
Participating students were given diaries at the beginning of the school term to record their thoughts, feelings, attitudes, and reflections on personal observations and learning experiences during Euclidean geometry lessons. Each student received a diary guide which informed them on what and when to record. Students were advised to keep diaries at home and record their reflections after school to avoid interfering with their normal school activities. Students were told not to share their diary entries with other participants to avoid bias in research findings. Students were informed that they were free to contact the researcher at any time to discuss issues regarding diary completion. The researcher also contacted each student daily to remind them to record their learning experiences and reflections. A total of ten diaries were completed and returned to the researcher. Five diaries were from the experimental group participants, and the other five came from the control group participants.Focus group participants were informed of the date, time and venue for the group discussions well in advance. The focus group discussions were held when the Grade 11 mathematics teachers had finished teaching the Euclidean geometry chapter. Four group discussions were held; each focus group was formed by the participating students from each school. A trained moderator was hired to facilitate the group discussions on behalf of the researcher. Focus group discussions were recorded using a digital voice recorder. The discussions lasted between one and half to two hours.

Data Analysis
Audio recordings of the focus group discussions were transcribed by the researcher and audited by the moderator. Focus group data were coded using Computer Assisted Qualitative Data Analysis Software (CAQDAS) called MAXQDA (Version 18). MAXQDA is a software package developed by a company called VERBI GmbH, based in Berlin, Germany. The program offers tools for importing documents, coding, categorising text segments, and retrieving the coded segments. Diary records were coded manually using word processor. In the context of this study, coding is a process of identifying information that addresses the variables of interest, and assigning a label (word or phrase) that best describes the information (Bazeley & Jackson, 2013). The coded data can be a single word, a phrase, a full sentence, a picture, or a whole page of text (Saldana, 2013). Saldana, adds that there is no best way to code qualitative data since variables of interest are context-specific. It is a matter of choosing the right instrument for the right job, a characteristic of the pragmatist paradigm. The qualitative data were categorised using labels showing the variables of interest. These were: views and thoughts, feelings and emotions, favourable and unfavourable teaching practices, and attitudes.
Several measures were taken to enhance trustworthiness of the qualitative research findings. Hiring an outsider to facilitate focus group discussions helped to avoid the presence of the researcher biasing students' responses. The selected facilitator entered the research field a month before the focus group discussions were held to establish rapport with the students. Prolonged engagement in the research site helps to gain the trust of the participants (Anney, 2014). As rapport increases, informants are more likely to disclose sensitive information and give honest responses (Sun, 2014). The use of two data collection methods to collect data on the same phenomenon helped to enhance the credibility of findings of the study. The confirmability of focus group discussion and diary findings was enhanced by asking participants to check whether research findings accurately reflected the views they provided (see Holloway & Wheeler, 2010;Thomas & Magilvy, 2011). In reporting results, direct quotations from student diaries and transcribed text were included "to show a connection between the data and the results" (Elo, Kääriäinen, Kanste, Pölkki, Utriainen, & Kyngäs, 2014, p. 6).
The study was granted ethical clearance by the University of South Africa College of Science, Engineering and Technology's Research and Ethics Committee. The study was also approved by the Limpopo Department of Education. Further permission was sought from the principals and school governing bodies of the targeted schools. The purpose of the study and the research activities were clearly explained in the letters addressed to the principals, school governing bodies, parents and students of the participating schools. Schools principals, parents and students signed consent forms to indicate that they voluntarily agreed to take part in the study.

FINDINGS AND DISCUSSION
In this section, qualitative data from students' diary entries and focus group discussions is presented and discussed. The presentation is divided into three parts. Part A presents data from students' diaries. Part B presents data from focus group discussions. Part C highlights the main ideas emerging from the discussion.

Part A: Students' Diary Records
A lot of information was recorded in the diaries. However, not every piece of information is worthy to cite and analyse here. Only segments containing the most important textual data will be extracted and analysed in this section.

Diary reports on lesson presentation
Control group students evaluated the way in which Euclidean geometry theorems and proofs were presented in their mathematics classes using words such as 'fast ', 'bad', 'not presented very well', 'confusing', 'not good', and 'hard'. The extracts in Figure 1 attest.

Figure 1. Control group students' lesson evaluations
In contrast, experimental group students used words such as 'amazing ', 'very good', 'nice', 'wonderful', 'excellent', 'fun and beneficial' to describe the way Euclidean theorems and proofs were presented in their mathematics classes. The phrases in Figure 2 give evidence.
It can be seen from the foregoing reports that students who were taught by their teachers using conventional approaches had negative views about the way Euclidean theorems and proofs were taught in their mathematics classes. Conversely, students from experimental schools who were taught using Van Hiele theory-based instruction gave positive comments on the approach used to teach Euclidean theorems and proofs in their mathematics classes.

Students' records of their feelings towards the geometry lessons
Analysis of control group students' diary reports revealed that they were not happy with the way Euclidean geometry theorems and proofs were taught in their mathematics classrooms. On the other hand, diarists from the experimental group recorded positive feelings about the way geometry lessons were delivered in their mathematics classrooms (see Figure 3).
Simply knowing that control group students were not happy with conventional approaches to teaching Euclidean theorems and proofs, and that their counterparts in the experimental group were satisfied with Van Hiele theory-based instruction, is not enough to help educators to improve. It is important to know exactly what teachers did in the control group mathematics classes which made students to be not . Students' feelings towards the geometry lessons happy, bored, angry and confused. Such knowledge helps to inform teachers on pedagogical practices that are not favoured by the students. Knowing the pedagogical practices that made experimental group students to enjoy learning, feel good, happy and motivated, is also essential. Such knowledge informs teachers on what they need to adjust on their current pedagogical practices for better teaching and learning of Euclidean theorems and proofs.

Favourable and unfavourable pedagogical practices
A number of concerns were raised by control group students with regard to their teachers' pedagogical practices. Figure 4 shows segments of text extracted from participant Ko's diary record. The student complained about the fast pace of teaching, inadequate explanations and inaccurate drawings.
Student Bo recorded inadequate worked examples, use of lecture method, lack of teacher support, hasty and invariable teaching, among the pedagogical practices that impeded the learning of Euclidean theorems and proofs in their mathematics class. Figure 5 shows segments of text extracted from Bo's diary.
Participants from the experimental group schools who were taught using Van Hiele theory-based instruction recorded the pedagogical practices they liked the most. Figure 6 displays segments of text extracted from student O's diary record.
Student O enjoyed being actively engaged in lessons, discussing and working collaboratively with other students, showing respect for each other, and being taught by a teacher who is patient. The student was also impressed by the fact that the teacher explained the terminology of Euclidean geometry and what the topic is all about. Learning about the history of Euclidean geometry, why we study Euclidean geometry and its contribution to people's lives, motivated some students in the experimental group to want to know more about the topic.
Being given an opportunity to suggest and express their own views on what is taught, together with the use of multiple solution methods contributed positively to students' understanding of Euclidean theorems and proofs in the experimental group. Student Mo's diary reports testify (see Figure 7). Student Na from the experimental group wrote extensively on the teaching practices that the student enjoyed the most. The student enjoyed being taught by a teacher who treated students equitably and allowed students to express themselves freely. Na recorded that the use of the Geometer's Sketch Pad (GSP) made geometry funny and easy. She enjoyed being taught by a teacher who is patient; one who makes sure that all students are moving at the same pace. The text in Figure  8 substantiates.
Student Na also liked being actively involved in the teaching and learning process. The student acknowledged that the teacher did not mind staying behind to clarify and re-teach some geometry concepts. Based on her Euclidean geometry learning experiences, student Na concluded that the teacher really knew how students' minds work.   (1) While the study could have been concluded based only on the students' diary reports, research methodologists argue that the diary method should not be used in isolation (Woll, 2013). It is for this reason that focus groups discussions were used to supplement the diary method. This gave the researcher an opportunity to seek more details on some of the issues reported by students in their diaries. Part B of this section presents research findings from the group discussions.

Part B: Focus Group Discussions
The key questions that were asked by the moderator to facilitate the discussions were presented in the methodology section under data collection instruments. Students' verbal reports with regard to how Euclidean geometry lessons were taught in their mathematics classroom are presented and discussed in the next section.

Students' verbal reports of their Euclidean geometry learning experiences
Focus group participants from control group schools raised several concerns about the way Euclidean geometry and geometry proofs were taught in their mathematics class. Students from school C1 expressed the opinion that Euclidean geometry was not properly introduced. They frequently mentioned that key words such as chord and diameter were not explained prior to the introduction of theorems. One student cited this as the reason many students had difficulties with geometry proofs. The following scripts provide evidence: Focus group participants from school C2 mentioned that learning Euclidean geometry and geometry proofs Figure 9. Na's reports on favourable teaching practices (2) was difficult for them because their teacher rushed through the chapter trying to cover the syllabus and skipped some sections [or concepts] in the process. The following scripts attest: Most of the views expressed by participants from the control group here are consistent with what students recorded in their diaries. An additional point mentioned here is the view that some teachers skipped some sections of Euclidean geometry.
While focus group participants from the control group reported negative learning experiences, their counterparts from the experimental group who were taught using Van Hiele theory-based instruction unanimously agreed that Euclidean geometry was taught well in their mathematics classes. The comments made by experimental group students here resonate with their diary evaluations of how Euclidean geometry lessons were presented in their mathematics classes. The next sub-section describes how participants felt about the way Euclidean geometry and geometry proofs were taught in their mathematics class.

Students' verbal descriptions of their feelings and emotions
Many focus group participants from control group schools expressed negative feelings about the way Euclidean geometry and geometry proofs were taught in their mathematics classes. Participants from school C2 reported that they felt bad about the way they were taught: Focus group participants from school C1 reported feelings of confusion: Mp: I feel confused because when our teacher teaches us, we understand but when we get home, nothing! Like, we don't understand anything because the teacher is no more there (FG C1, Position: 29 -29).
Bo: I feel like this geometry is understandable but our teacher didn't be specific on that geometry, that's why we are a little bit confused (FG C1, Position: 31 -31).
It can be seen from the above statements that focus group participants from control group schools were unhappy with the way Euclidean geometry and geometry proofs were taught in their mathematics classes, just as they reported in their diaries. The students were fully aware that Euclidean geometry constitutes a lot of marks in their examination papers but were frustrated at their teachers' failure to help them understand the topic.
Contrastingly, focus group participants from the experimental group schools felt good about the way Euclidean geometry and geometry proofs were taught in their mathematics classes. The following scripts provide proof: Based on these responses, experimental group students' positive feelings can be attributed to the following aspects: being actively involved in the learning process; sharing their own views and thoughts on what is being taught; exploring geometry concepts freely in the presence of their classmates; achieving what they thought they cannot achieve; learning Euclidean geometry concepts practically, not just theoretically, and lastly; seeing the connection between Euclidean geometry concepts and real life situations. These views are consistent with what the students recorded in their diaries.
To gain more insight into students' views and feelings, focus group participants from both experimental and control group schools were asked to specify exactly what they liked or disliked about the way Euclidean geometry and geometry proofs were taught in their mathematics class. The students mentioned a wide range of teaching and learning experiences which they thought had the greatest impact on their views and feelings. The next sub-section presents the most striking responses that emerged from the group discussions.

Students' verbal reports on favourable and unfavourable teaching practices
When prompted to discuss what they liked and disliked about how Euclidean geometry and geometry proofs were taught in their mathematics class, participants from control group schools indicated that they did not like the teaching approaches used in their mathematics classes. The key concerns raised by participants included: teachers teaching at a fast pace to cover the syllabus; teachers skipping some sections of the Euclidean geometry chapter; teachers being impatient and insensitive to the needs of slow learners; teachers making negative comments; and the teachers themselves showing a negative attitude towards Euclidean geometry. These issues are evident in the following comments: The comment by student Mp from school C1 that the teacher changed his attitude when teaching Euclidean geometry raises questions on the teacher's ability to teach the topic.
While focus group participants from control group schools reported teaching practices they did not like, students from experimental group schools mentioned the pedagogical practices they enjoyed. These included among others: the use of Geometer's Sketchpad to investigate theorems; teaching at a slow and moderate pace; being sensitive to students' learning needs; active engagement of all students in the class; and a free learning environment where making mistakes and giving wrong answers is part of the learning process. Participants' responses reflecting these ideas included: Ch: Eh, that part when we were taught in our maths class when we were using computers using the GSP software, … was really good for us as learners because it wasn't like reading those theorems in a book. We were actually seeing them first-hand. We were actually measuring those angles. Most of the views expressed by the students here resonate with results obtained from students' diary reports. In the last part of the focus group discussions, participants were asked to describe their prevailing attitudes towards Euclidean geometry and geometry proofs based on their learning experiences. A number of valuable and insightful responses were given, the details of which are presented in the next sub-section.

Students' attitudes towards Euclidean geometry and geometry proofs
When control group students were asked to describe their prevailing attitudes towards Euclidean geometry based on their learning experiences, most of responses given were negative. Dominant responses that emerged from discussions with control group participants included:

Part C: Emerging Issues
Students from control group schools were not happy with the way Euclidean geometry and proof lessons were presented in their mathematics classes. Comments such as 'The lesson was fast' and 'He taught us like we are at university' provide evidence to the continued use of teacher-centred approaches in the teaching of Euclidean geometry in secondary schools. This confirms what was reported in literature by Abdullah Zakaria (2013), Bramlet andDrake, 2013, andSiyepu (2014). As the teacher moved fast to cover the syllabus, the students were left behind. To make matters worse, the teacher in one of the control group schools was not willing to provide additional support to students who needed extra attention. When students approached the teacher for help outside lesson time, the teacher gave all sorts of excuses to avoid helping the students. One student from school C1 observed that the teacher changed his attitude and behaved unusually when teaching Euclidean geometry. This, together with the fact that the teacher in school C2 skipped some sections of Euclidean geometry, points to the view that the teachers themselves could be having challenges with not only the methodology but also the content of Euclidean geometry. This is not surprising given that some teachers have no previous contact with the topic as reported by Govender (2014).
The teacher in school C1 moved straight into proving theorems without checking if students had mastered the prerequisite knowledge. This contradicts what the Van Hiele theory proposes. The teacher's failure to explain the meaning of key words such as chord and diameter before introducing theorems made it difficult for some students to understand proofs. The Van Hiele theory stresses the importance of developing the language of the Euclidean geometry. The role of language in learning mathematics is a widely researched topic (see for example, Craig & Morgan, 2015;Mulwa, 2014;Naziev, 2018;Robertson & Graven, 2019). According to Robertson and Graven (2019), language can "either include or exclude certain groups of students from genuine opportunities for mathematical sense-making" (p. 77). Thus, by not teaching students the terminology of Euclidean geometry, teachers exclude some students from understanding geometry concepts.
Teaching Euclidean geometry using traditional methods made students in the control group schools to feel discouraged, bored, angry, confused and heartbroken during lessons, resulting in a negative and bad attitude towards the topic. Comments such as 'We didn't understand anything on this theorem' and 'I thought the lesson will be presented in a different way which I will understand' call for teachers to change their approaches to teaching Euclidean geometry and try something different.
In stark contrast to the views expressed by control group students, students from the experimental group schools who were taught using the Van Hiele theorybased model were satisfied with the approach used to teach Euclidean geometry in their classes. Students in the experimental group used words such as 'very good ', 'wonderful' and 'excellent' to evaluate how they were taught. The Van Hiele theory-based approach left students feeling 'happy' and 'motivated', with a positive attitude towards the topic. Giving students information about the origin of Euclidean geometry, why the topic should be studied in schools, and its application in real life situations, made students to gain interest in learning the topic. The use of the Geometer's Sketch pad (GSP) to explore geometry concepts made Euclidean geometry lessons to be 'fun and beneficial'. In addition, the GSP offered students an opportunity to re-invent the theorems and see the results for themselves instead of memorizing theorems from the textbook.
Experimental group students enjoyed learning in a free environment where they exercised freedom of expression, and making mistakes was part of learning. This is in line with the Van Hiele's idea of free orientation. Students in the experimental group reported that they enjoyed being taught by a teacher who was patient and not in a hurry. Thus, implementing Van Hiele theory-based instruction requires the teacher to value students' understanding more than syllabus coverage. Experimental group students mentioned that the teacher made sure that students were 'on the same page and moving at the same pace all the time' (see Figure 8). The pace of teaching was regulated by the students' level of understanding, not the pressure to finish the syllabus in a stipulated time-frame.
Discussing and sharing multiple ways to solve riders during the integration phase, and working collaboratively in pairs and groups without judging each other, are among the pedagogical practices favoured by students in the experimental group. Students in the experimental group acknowledged the teacher's readiness to support and help students who needed extra attention. They also reported that they were treated equitably. The active engagement of students in the learning process as opposed to just listening to the teacher, was also liked by students in the experimental group (see Figure 6 & Figure 9). Last but not least, Van Hiele theory-based instruction changed students' attitude towards Euclidean geometry and proofs from being negative to positive.
From the foregoing discussion, it can be seen that traditional approaches to teaching Euclidean geometry theorems and proofs impede learning progress. Based on the students' reflections, Van Hiele theory-based instruction seems to offer more benefits to the students than the use of traditional methods in the teaching and learning of Euclidean geometry and proofs.

RECOMMENDATIONS AND CONCLUSION
Based on the outcomes of this study, the following recommendations are proposed: Mathematics teachers need training on how to implement unconventional teaching approaches such as Van Hiele theory-based instruction in teaching Euclidean geometry.
Students should regularly be given an opportunity to voice their concerns in the teaching and learning of Euclidean geometry. Feedback from the students can be used to realign instruction to meet the learning needs of the students.
There is need to investigate Euclidean geometry competencies of individual mathematics teachers to identify areas where they may need to be supported.
In conclusion, mathematics teachers should remember that pedagogical content knowledge is dynamic. New research findings may require teachers to part ways with teaching approaches and practices they have used for decades to embrace new pedagogical knowledge. It is every mathematics teacher's responsibility to stay up to date with emerging views in mathematics education. A good mathematics teacher is a life-long learner, who engages in continuous research to find new and better ways to teach different mathematics topics. Euclidean geometry cannot be taught like any other mathematics topic. It requires teachers to have special pedagogical knowledge for teaching this valuable mathematics topic.