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

Abstract

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.