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Activity: Exterior Angles in a Polygon
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Students construct a pentagon with its exterior angles, measure the angles and find the sum. They then dilate the pentagon to look at the problem, and understand their result, in a new way. The link to the activity itself is to a zip file that contains a pdf file of the 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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Activity: Exploring Geometry with The Geometer's Sketchpad
Courses: Geometry Exterior, Polygons