Find the radian measure of interior angle of a regular pentagon
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A regular pentagon has 5 sides, 5 interior and 5 exterior angles. Each exterior angle is 360/5 = 72 degrees and each interior angle is 180–72 = 108 degrees. 180 degrees = (pi) radians, so 108 degrees = (108/180) radians or (3/5) radians. So the interior angle is 108 degrees or (3/5) radians.
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