XK-TST 2022 Problem 3
Let be a triangle and point on side such that is angle bisector of angle . Let be the intersection of the side with circle which has diameter and let be the intersection of the side with circle which has diameter . Suppose that there exist points and such that and are collinear and on this order. Prove that and are concurrent.
Proposed by Dorlir Ahmeti, Kosovo and Noah Walsh, U.S.A.
Dataset text AI-MO AoPS. Quoted with source.
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