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The sum of the exterior angles is 360 so if each is 120 we know 360/120=3.

This tells us there are 3 exterior angles.

The sum of the interior angles in a triangle is 180 degrees.

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βˆ™ 2011-06-22 14:24:17
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Q: What is the sum of the measures of the interior angle of a regular plygon if each exerior angle measures 120?
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