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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 14, 2021
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I think the image above (drawn on GeoGebra) summarizes the situation in your problem. I leave it to you to decide which way you rotate (clockwise or counterclockwise) and by what angle. Good luck.

 Jun 15, 2021

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