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Mathematics 9 Online
OpenStudy (anonymous):

fjh The measure of an exterior angle of a regular 20-gon is what?

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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