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Find the maximum of h1 + h2 + h3

Source: IMO Longlist 1989, Problem 65

September 18, 2008
geometry unsolvedgeometry

Problem Statement

Let ABCD ABCD be a quadrilateral inscribed in a circle of radius AB AB such that BC \equal{} a, CD \equal{} b, DA \equal{} \frac{3 \sqrt{3} \minus{} 1}{2} \cdot a For each point M M on the semicircle with radius AB AB not containing C C and D, D, denote by h1,h2,h3 h_1, h_2, h_3 the distances from M M to the straight lines (sides) BC,CD, BC, CD, and DA. DA. Find the maximum of h_1 \plus{} h_2 \plus{} h_3.