olymmath

ISL 2023 G1

    Let ABCDEA B C D E be a convex pentagon such that ∠ABC=∠AED=90∘\angle A B C=\angle A E D=90^{\circ}. Suppose that the midpoint of CDC D is the circumcentre of triangle ABEA B E. Let OO be the circumcentre of triangle ACDA C D. Prove that line AOA O passes through the midpoint of segment BEB E. (Slovakia)

    Dataset text NuminaMath olympiads. Quoted with source.

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