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Let A_1 A_2 A_3 ... A_{10} be a regular polygon. A rotation centered at A_1 with an angle of a takes A_2 to A_{10}. Given that a < 180 degrees, find a, in degrees.

 Jun 15, 2021
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This problem has been posted at at least 3 other occasions and at two of those answers have been provided.

 Jun 16, 2021

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