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Tool: Proof as Explanation: Distances in an Equilateral Triangle
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Go to: http://www.keypress.com/.../Distances.zip (opens a new window)
Description:

Students explore the sum of certain distances in an equilateral triangle, and develop a proof to explain their observations. The link to the tool itself is to a zip file that contains both the sketch and a pdf file of the corresponding activity.

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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Activities: Rethinking Proof with The Geometer's Sketchpad
Proof as Explanation: Distances in an Equilateral Triangle
Courses: Geometry Logic and proof, Equilateral