olymmath

ISL 2022 G3

    Let ABCDA B C D be a cyclic quadrilateral. Assume that the points Q,A,B,PQ, A, B, P are collinear in this order, in such a way that the line ACA C is tangent to the circle ADQA D Q, and the line BDB D is tangent to the circle BCPB C P. Let MM and NN be the midpoints of BCB C and ADA D, respectively. Prove that the following three lines are concurrent: line CDC D, the tangent of circle ANQA N Q at point AA, and the tangent to circle BMPB M P at point BB. (Slovakia)

    Dataset text NuminaMath olympiads. Quoted with source.

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