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OpenStudy (anonymous):

what is the measure of the interior angles of a 20-gon

OpenStudy (elonasushchik):

Medal for this and fan.

OpenStudy (elonasushchik):

or, using the exterior angles... the exterior angles add to 360 for any polygon 360 / 20 = 18 degrees per exterior angle the interior and exterior angles are supplementary, so 180 - 18 = 162 degrees per interior angle:

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