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ELMO 2022 Problem 4

    Let ABCDEABCDE be a convex pentagon such that △ABE\triangle ABE , △BEC\triangle BEC , and △EDB\triangle EDB are similar (with vertices in order). Lines BEBE and CDCD intersect at point TT . Prove that line ATAT is tangent to the circumcircle of △ACD\triangle ACD .

    Holden Mui

    Dataset text AI-MO AoPS. Quoted with source.

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