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in geometry, an icosagon is a twenty side of a polygon or 20-gon. the sum of any icosagon's  internal angles is 3240 degrees.

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In geometry,an icosagon is a twenty sided polygon or 20-gon.the sum of any icosagon's interior angles is 3240 degrees.one interior angle in a regular icosagon is 162° meaning that one exterior angle would be 18°.
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