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PL-OM 2021 Problem 5

    A convex hexagon ABCDEFABCDEF is given where ∡FAB+∡BCD+∡DEF=360∘\measuredangle FAB + \measuredangle BCD + \measuredangle DEF = 360^{\circ} and ∡AEB=∡ADB\measuredangle AEB = \measuredangle ADB . Suppose the lines ABAB and DEDE are not parallel. Prove that the circumcenters of the triangles △AFE,△BCD\triangle AFE, \triangle BCD and the intersection of the lines ABAB and DEDE are collinear.

    Dataset text AI-MO AoPS. Quoted with source.

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