MathDB
13rd ibmo - rep. dominicana 1998/q2.

Source: Spanish Communities

April 16, 2006
geometry unsolvedgeometry

Problem Statement

The circumference inscribed on the triangle ABCABC is tangent to the sides BCBC, CACA and ABAB on the points DD, EE and FF, respectively. ADAD intersect the circumference on the point QQ. Show that the line EQEQ meet the segment AFAF at its midpoint if and only if AC=BCAC=BC.