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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.

 Jan 2, 2022
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All credit to EP and Melody

https://web2.0calc.com/questions/halp-im-so-confused

 Jan 2, 2022

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