PL-OM 2021 Problem 3
Let be the circumcircle of a triangle . Let be any point on different than the verticies of the triangle. Line intersects at , intersects at and intersects at . Let be the projection of onto line passing through midpoints of and , be the projection of onto line passing through and and let be the projection of onto line passing through midpoints of and . Let be the circumcenter of triangle . Prove that all possible points , corresponding to different positions of lie on one circle.
Dataset text AI-MO AoPS. Quoted with source.
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