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Measurement of a 18 gon of its interior and exterior
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Measurement of a 18 gon of its interior and exterior

User Soryn
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There will be 18 exterior angles, each of 360/18 = 20 deg. So each interior angle, which is supplementary to the exterior angle will be 180–20 - 160 deg. The sum of the 18 interior angles = 18*160 = 2880 deg.

User LucaMus
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