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35th Austrian Mathematical Olympiad 2004

Source: round3, day2, problem3 - highest area of a triangle

February 13, 2009
geometrygeometry unsolved

Problem Statement

Over the sides of an equilateral triangle with area 1 1 are triangles with the opposite angle 60∘ 60^{\circ} to each side drawn outside of the triangle. The new corners are P P, Q Q and R R. (and the new triangles APB APB, BQC BQC and ARC ARC) 1)What is the highest possible area of the triangle PQR PQR? 2)What is the highest possible area of the triangle whose vertexes are the midpoints of the inscribed circles of the triangles APB APB, BQC BQC and ARC ARC?