olymmath

OMM 2010 Problem 5

    Sea ABCABC un triángulo acutángulo con AB≠ACAB \neq AC, MM el punto medio de BCBC y HH el ortocentro de ABCABC. La circunferencia que pasa por BB, HH y CC corta a la mediana AMAM en NN. Muestra que ∠ANH=90∘\angle ANH = 90^\circ.

    Official text Mexican Mathematical Olympiad 2010 official paper, page 2. Quoted with source.

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