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ABCDEF is a hexagon inscribed in a unit circle with AB = CD = EF = 1. Let X, Y, Z, be the midpoints of the other three sides (i.e., of BC, DE, and FA). Prove that XYZ is an equilateral triangle.
(PS: If any of you find a non-trigonometry solution, do tell!)© Copyright 1999 Stan Wagon. Reproduced with permission.
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