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Formula of the sum of the interior angles of all polygons = 180(n-2) where n = number of sides
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Regular Polygon Formulas:
Perimeter: P=ns 

Central Angle: theta=360/n

Interior Angle: 180°(n-2)/n

Sum of Interior Angles: 180(n-2)

Area: ns²/4tan(180/n)

Diagonal: n/2(n-3)

n is the number of sides
s is the length of the sides.
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