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If it's a regular polygon and each exterior angle measures 72 degrees then it is a pentagon which has 5 sides
360 ÷ 72 = 5, so that the regular polygon is a pentagon (a five-sided polygon).
Let n be the number of sides of the regular polygon. Given: (360 / n) = 72 Therefore, n = 360 / 72 = 5 =========================
360/72 ie 5 sides
5