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Tool: Proof as Verification: Areas
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Go to: http://www.keypress.com/.../Areas.zip (opens a new window)
Description:

Students form a conjecture about the ratio of two areas in a quadrilateral, and use Sketchpad to search for a proof. In the process they verify or disprove their results for two different kinds of quadrilaterals. The link to the tool itself is to a zip file that contains both the sketch and a pdf file of the corresponding activity.

The combined sketch and pdf activity file are also available in .sit format. 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: Proof as Verification: Areas
Rethinking Proof with The Geometer's Sketchpad
Courses: Geometry Logic and proof, Quadrilaterals