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OpenStudy (anonymous):
fjh The measure of an exterior angle of a regular 20-gon is what?
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OpenStudy (anonymous):
Use (n-2)180 to find the sum of all angles in the polygon. So (20-2)180 = 3240 Dividing 3240 by 20 will give you the measure of 1 interior angle since all angles are equal. An exterior angle will just be the supplementary of an interior.
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