OMM 2025 Problem 1
Sea un paralelogramo. La circunferencia de diámetro corta a las rectas y en los puntos y , respectivamente, con y distintos de . La recta interseca a los lados y en los puntos y , respectivamente. Demuestra que el centro de la circunferencia que pasa por los puntos , y , está en la recta .
Official text Mexican Mathematical Olympiad 2025 official paper, page 41. Quoted with source.
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