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Exterior Angle = 360/number of sides. Interior Angle = 180 - Exterior Angle. Combining Interior Angle = 180 - (360/number of sides).
Each interior angle: 140 degrees Each exterior angle: 40 degrees
If one interior angle is 165 degrees, find the number of sides of the polygon.
999999
180-interior angle = exterior angle If it's a regular polygon then: 360/number of sides = exterior angle