Texas Instruments
Texas Instruments: Centers of a Triangle
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.]
Other
Center for Technology and Teacher Education:centers of Triangles Lesson Part Two
This is the second 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.
Other
Center for Technology and Teacher Education:centers of Triangles Lesson Part One
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.
Other
Ctte: Geometer's Sketch Pad Activities
This site offers numerous activities for middle school and high school students to explore using Geometer's Sketch Pad.