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OpenStudy (ashley_fay):
what is the sum of the measures of the interior angle of a regular polygon if each exterior angle measures 120 degrees?
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OpenStudy (mathstudent55):
The sum of the measures of the exterior angles of any polygon is 360. From this, you can find how many vertices (and sides) there are. Then the sum of the interior angles of a polygon is (n-2)180, where n = number of sides.
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