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angle between 2 digaonals of regular 10-gon 2016-17 Dürer Round1 C1

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December 9, 2022
DurergeometryanglesDecagon

Problem Statement

The vertices of Durer's favorite regular decagon in clockwise order: D1,D2,D3,...,D10D_1, D_2, D_3, . . . , D_{10}. What is the angle between the diagonals D1D3D_1D_3 and D2D5D_2D_5?
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