# 8.7: Triangle Sum Theorem

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Exterior angles

An exterior angle is the angle formed by one side of a polygon and the extension of the adjacent side.Interior angles

Interior angles are the angles inside a figure.Triangle

A triangle is a polygon with three sides and three angles.Triangle Sum Theorem

The Triangle Sum Theorem states that the three interior angles of any triangle add up to 180 degrees.### Image Attributions

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Learn about the sum of the angles of triangles.

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Date Created:

Dec 02, 2015
Last Modified:

Sep 08, 2016
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