Well, honey, an exterior angle of a polygon can be found by dividing 360 degrees by the number of sides. So for a 20-gon, each exterior angle would be 18 degrees. It's as simple as that, darling.
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Providing that it is a regular 20-gon then each exterior angle is 360/20 = 18 degrees
Each exterior angle measures 72 degrees
Each exterior angle measures 20 degrees Each interior angle measures 160 degrees
exterior angle theorem
Each interior angle is 156 degreesEach exterior angle is 24 degrees
Each interior angle: 140 degrees Each exterior angle: 40 degrees