2001 OIM Problems/Problem 2

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Problem

The circle inscribed in the triangle $ABC$ has center $O$ and is tangent to the sides $BC$, $AC$ and $AB$ at points $X$, $Y$ and $Z$, respectively. The lines $BO$ and $CO$ intersect to the line $YZ$ at points $P$ and $Q$, respectively. Show that if the segments $XP$ and $XQ$ have the same length, then the triangle $ABC$ is isosceles.

~translated into English by Tomas Diaz. ~orders@tomasdiaz.com

Solution

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See also