The centroid, circumcenter, orthocenter, and incenter are the four classic centers of a triangle that are studied in geometry. In this activity, you will construct these center points and discover their properties. [Requires Adobe Reader.]

This is the second of two consecutive lesson plans concerning the centers of a triangle. The lesson plan requires the use of Geometer's Sketch Pad. The lesson plan contains real world applications of some of the concurrent points of a...

This is the first of two consecutive lesson plans concerning the centers of a triangle. The lesson requires the use of Geometer's Sketch Pad. The lesson contains real world applications of some of the concurrent points of a triangle.

This site offers numerous activities for middle school and high school students to explore using Geometer's Sketch Pad.