Activity: Proof as Explanation: Distances in an Equilateral Triangle  
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 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  
Tool:  Proof as Explanation: Distances in an Equilateral Triangle  
Courses:  Geometry  Logic and proof, Equilateral  
