Thursday, September 30, 2010
14th Mexican Mathematical Olympiad Problems 2000
14th Mexican Mathematical Olympiad Problems 2000A1. A, B, C, D are circles such that A and B touch externally at P, B and C touch externally at Q, C and D touch externally at R, and D and A touch externally at S. A does not intersect C, and B does not intersect D. Show that PQRS is cyclic. If A and C have radius 2, B and D have radius 3, and the distance between the
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