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Tool: Areas of Regular Polygons and Circles
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Students manipulate the number of sides in a regular polygon, develop a formula relating the area and perimeter of the polygon, and use their result to develop a formula relating the circumference and area of a circle. 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 Exploring Geometry with the Geometer's Sketchpad.

Technology Type: Sketchpad 
Author: Key Curriculum Press/Dan Bennett
Language: English 
Cost: Does not require payment for use

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Activities: Exploring Geometry with The Geometer's Sketchpad
Areas of Regular Polygons and Circles
Courses: Geometry Circles, Pi, Regular polygons

Student Review (Not based on classroom experience)
Reviewer: Deatra, Dec 6 2005 06:30:32:863PM
Appropriate for: practice of skills and understandings
Ability to meet my goals: Effective
Recommended for: Math 7: Ratio and proportion, Geometry in the plane, Geometry in space, Measurement
Geometry: Polygons
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