DIGITAL LIBRARY
INTEGRATING GEOGEBRA IN TEACHING INSCRIBED ANGLE THEOREM AND ITS PROOF – A LESSON STUDY
1 De La Salle University (PHILIPPINES)
2 De La Salle University and Philippine Normal University (PHILIPPINES)
About this paper:
Appears in: INTED2018 Proceedings
Publication year: 2018
Pages: 8670-8675
ISBN: 978-84-697-9480-7
ISSN: 2340-1079
doi: 10.21125/inted.2018.2109
Conference name: 12th International Technology, Education and Development Conference
Dates: 5-7 March, 2018
Location: Valencia, Spain
Abstract:
Teaching students on how to write proofs is a daunting task for the teachers as it requires good reasoning skills among students. Several studies in the Philippines have shown that the students' reasoning skills does not match the level of skill required for them to write geometric proofs. A change in the teaching practices such as exposing the students to manipulative tasks is suggested as it constantly improves their thinking skills and results to a better understanding of mathematics concepts and principles.

This paper reports on a lesson study that explored the use of GeoGebra, a dynamic geometry software, as an alternative way to teach the Inscribed Angle Theorem and its proof. Lesson Study (LS) is a professional development approach focused on improving the teaching-learning process on a particular lesson where teachers work collaboratively. LS involves planning, formulating the design of the lesson, teachers’ observation, and post-lesson conference where the observers share their insights about the lesson.

Using the ‘Plan, Do, See’ Cycle, the results showed that:
(1) using and maximizing a dynamic geometry software such as GeoGebra can assist the students in constructing figures, recognizing patterns, and creating generalizations in a shorter period of time, which then leads them in attaining more meaning and deeper understanding of the lesson; and
(2) the positive effects of a teaching-learning intervention could only be maximized if the students’ skills match the skills required for a learning competency.
Keywords:
ICT integration, digital natives, inscribed angle, Inscribed Angle Theorem, proving, lesson study, GeoGebra.