OMM 2009 Problem 1
Sea un triángulo y la altura sobre el lado . Tomando a como centro y a como radio, se traza una circunferencia que corta a la recta en , y corta a la recta en . Muestra que el triángulo es semejante al triángulo .
Official text Mexican Mathematical Olympiad 2009 official paper, page 1. Quoted with source.
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