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PL-OM 2021 Problem 3

    Let ω\omega be the circumcircle of a triangle ABCABC . Let PP be any point on ω\omega different than the verticies of the triangle. Line APAP intersects BCBC at DD , BPBP intersects ACAC at EE and CPCP intersects ABAB at FF . Let XX be the projection of DD onto line passing through midpoints of APAP and BCBC , YY be the projection of EE onto line passing through BPBP and ACAC and let ZZ be the projection of FF onto line passing through midpoints of CPCP and ABAB . Let QQ be the circumcenter of triangle XYZXYZ . Prove that all possible points QQ , corresponding to different positions of PP lie on one circle.

    Dataset text AI-MO AoPS. Quoted with source.

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