olymmath

RMM 2016 Problem 1

  • Day 1

Let ABCA B C be a triangle and let DD be a point on the segment BC,D≠BB C, D \neq B and D≠CD \neq C. The circle ABDA B D meets the segment ACA C again at an interior point EE. The circle ACDA C D meets the segment ABA B again at an interior point FF. Let A′A^{\prime} be the reflection of AA in the line BCB C. The lines A′CA^{\prime} C and DED E meet at PP, and the lines A′BA^{\prime} B and DFD F meet at QQ. Prove that the lines AD,BPA D, B P and CQC Q are concurrent (or all parallel).

Dataset text NuminaMath olympiads. Quoted with source.

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