Find the sum of angles with ten sides
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The sum of the external angles of any convex polygon is 360°. Since there are 10 equal external angles, each is 36°. The internal angle is the supplement of the external angle, so each internal angle of a 10-sided polygon (i.e., a regular decagon) is 180° - 36° = 144°.
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A decagon is a ten same ded polygon with ten interior angles and ten vertexs. Each angle measures 144° and can be added up to 1440°
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