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2009 IMO Problems/Problem 2: Difference between revisions

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''Author: Sergei Berlov, Russia''
''Author: Sergei Berlov, Russia''
--[[User:Bugi|Bugi]] 10:22, 23 July 2009 (UTC)Bugi

Revision as of 12:03, 10 July 2012

Problem

Let $ABC$ be a triangle with circumcentre $O$. The points $P$ and $Q$ are interior points of the sides $CA$ and $AB$ respectively. Let $K,L$ and $M$ be the midpoints of the segments $BP,CQ$ and $PQ$, respectively, and let $\Gamma$ be the circle passing through $K,L$ and $M$. Suppose that the line $PQ$ is tangent to the circle $\Gamma$. Prove that $OP=OQ$.

Author: Sergei Berlov, Russia

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