olymmath

IGO 2019 I1

  • Intermediate

Two circles ω1\omega_1 and ω2\omega_2 with centers O1O_1 and O2O_2 respectively intersect each other at points AA and BB , and point O1O_1 lies on ω2\omega_2 . Let PP be an arbitrary point lying on ω1\omega_1 . Lines BP,APBP, AP and O1O2O_1O_2 cut ω2\omega_2 for the second time at points XX , YY and CC , respectively. Prove that quadrilateral XPYCXPYC is a parallelogram.

Proposed by Iman Maghsoudi

Dataset text AI-MO AoPS. Quoted with source.

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