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Let P be a regular nonagon with side length 2, and let S be the set of points that are within a distance of 1 from S.  (That is, a point X is in S if there exists a point Y in P such that XY <= 1.)  What is the perimeter of P?

 Dec 2, 2022
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The perimeter of P is 16.

 Dec 3, 2022

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