olymmath

OMM 2007 Problem 6

    Sea ABCABC un triángulo tal que AB>AC>BCAB > AC > BC. Sea DD un punto sobre el lado ABAB de tal manera que CD=BCCD = BC, y sea MM el punto medio del lado ACAC. Muestra que BD=ACBD = AC si y sólo si ∠BAC=2∠ABM\angle BAC = 2\angle ABM.

    Official text Mexican Mathematical Olympiad 2007 official paper, page 1. Quoted with source.

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