olymmath

APMO 2019 Problem 3

  • Paper

Let ABCA B C

be a scalene triangle with circumcircle Γ\Gamma. Let MM be the midpoint of BCB C. A variable point PP is selected in the line segment AMA M. The circumcircles of triangles BPMB P M and CPMC P M intersect Γ\Gamma again at points DD and EE, respectively. The lines DPD P and EPE P intersect (a second time) the circumcircles to triangles CPMC P M and BPMB P M at XX and YY, respectively. Prove that as PP varies, the circumcircle of △AXY\triangle A X Y passes through a fixed point TT distinct from AA.

Dataset text NuminaMath olympiads. Quoted with source.

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