MathDB
Turkey Junior Olympiad 1999, Part II - P1

Source:

January 18, 2013

Problem Statement

The chord [CD][CD] is parallel to the diameter [AB][AB] of a circle with center OO. The tangent line at AA meet BCBC and BDBD at EE and FF. If AB=10|AB|=10, calculate AEAF|AE|\cdot |AF|.