olymmath

BALTIC-WAY 2023 Problem 12

    Let ABCA B C be an acute triangle with AB>ACA B>A C. The internal angle bisector of ∠BAC\angle B A C intersects BCB C at DD. Let OO be the circumcentre of ABCA B C. Let AOA O intersect the segment BCB C at EE. Let JJ be the incentre of AEDA E D. Prove that if ∠ADO=45∘\angle A D O=45^{\circ} then OJ=JDO J=J D.

    Dataset text NuminaMath olympiads. Quoted with source.

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