GeoGebra as a tool to explore, conjecture, verify, justify, and prove: The case of a circle

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Yip-Cheung Chan


GeoGebra is a good platform for experimentation which supports the development of mathematical concepts and the abilities to explain geometric properties. In this paper, a series of GeoGebra activities which aims at consolidating students’ understandings on the concepts of center and radius and developing the concepts of locus and perpendicular bisector through experiencing the process of exploring, conjecturing, verifying, justifying and proving is described.

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Author Biography

Yip-Cheung Chan, The Chinese University of Hong Kong

Senior Lecturer, Department of Curriculum and Instruction, The Chinese University of Hong Kong