Kamis, 23 September 2010

4th Brazilian Mathematical Olympiad Problems 1982

4th Brazilian Mathematical Olympiad Problems 19821.  The angles of the triangle ABC satisfy ∠A/∠C = ∠B/∠A = 2. The incenter is O. K, L are the excenters of the excircles opposite B and A respectively. Show that triangles ABC and OKL are similar.