Education Technology

Angles in Polygons

Published on 01/23/2013

Activity Overview

In this activity, students measure interior angles in convex polygons and find the sum of the angle measures. They make and test a conjecture about the sum of the angle measures in an n-sided polygon. Finally, they measure exterior angles in convex polygons, find their sum, and write a proof for the sum of the exterior angles.

Key Steps

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    In this activity, students measure interior angles in convex polygons and use the Calculate tool to find the sum of the angle measures. They keep a record of the sums and make and test a conjecture about the sum of the angle measures in an n-sided polygon.

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    Students will also measure exterior angles in convex polygons and find their sum. They will use this knowledge to complete a two-column proof about the sum of the exterior angles.