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Activity: Proof as Systematization: Triangle Midpoints
Go to: http://www.keypress.com/.../TriangleMidpoints.zip (opens a new window)
Description:

Students use Sketchpad to develop a proof for a result that was discovered and used (without proof) in an earlier activity. The link to the activity itself is to a zip file that contains both the activity in pdf format and the corresponding sketch.

This is a free sample activity from Rethinking Proof with the Geometer's Sketchpad.

Technology Type: Sketchpad 
Author: Key Curriculum Press/Michael de Villiers
Language: English 
Cost: Does not require payment for use

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Activity: Rethinking Proof with The Geometer's Sketchpad
Courses: Geometry Logic and proof, Triangles