olymmath

ELMO SL 2013 G2

    Let ABCABC be a scalene triangle with circumcircle Γ\Gamma , and let DD , EE , FF be the points where its incircle meets BCBC , ACAC , ABAB respectively. Let the circumcircles of △AEF\triangle AEF , △BFD\triangle BFD , and △CDE\triangle CDE meet Γ\Gamma a second time at X,Y,ZX,Y,Z respectively. Prove that the perpendiculars from A,B,CA,B,C to AX,BY,CZAX,BY,CZ respectively are concurrent.

    Proposed by Michael Kural

    Dataset text AI-MO AoPS. Quoted with source.

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