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Through how many different positive angles less than 360 degrees is it possible to rotate a regular icosagon (20-gon) clockwise about its center such that its image coincides with the original icosagon?

 Apr 18, 2021
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interior angles =   (n-2)(180) = 3240 total     Each is 162       exterior angle is 18

360 /18 = 20

 

Short of it     20 different angles

 Apr 18, 2021

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