The aim of this study was to have Thai preservice mathematics teachers explore and visualize various centers of a triangle (incenter, orthocenter, centroid, circumcenter and excenter) using the Geometry Explorer program. The participants comprised of 40 Thai preservice mathematics teachers at Rajabhat Rajanagarindra University, Thailand who enrolled in Foundations of Geometry course during the second semester of the 2015 academic year. The research instruments used in this study were activities package exploring properties of triangle centers using the Geometry Explorer program. The results indicated that Thai preservice mathematics teachers could locate centers related to triangle, make conjectures and verify them correctly and rapidly. Therefore, we could use this program in teaching triangle centers topic in Euclidean geometry effectively.
Charuwan Singmuang, Rajabhat Rajanagarindra University, Thailand
Stream: Teaching and Learning
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