360/exterior angle = number of sides of a regular polygon
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I assume you mean a polygon inscribed in a circle. It is regular if all its sides and angles are equal.
The formula to find the measure of an interior angle in a regular polygon is [(n-2)(180)]/n In other words, you take the number of sides in a regular polygon, such as a rhombus, and subtract two. Then multiply that by 180. Lastly, divide by the number of sides.
360/number of sides and deduct the quotient from 180 which will give the measure of each interior angle
0.5*(n2-3n) where n is equal to the number of sides of the polygon
The formula is: 0.5*(n2-3n) where n is the number of sides of the polygon