2004 OIM Problems/Problem 5

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Problem

Given a scalene triangle $ABC$, Let $A', B'$ and $C'$ the points of intersection of the interior bisectors of angles $A, B$ and $C$ with the opposite sides, respectively. Let $A''$ be the intersection of $BC$ with the perpendicular bisector of $AA'$; $B''$ be the intersection of $AC$ with the perpendicular bisector of $BB'$; and $C''$ be the intersection of $AB$ with the perpendicular bisector of $CC'$. Prove that $A''$, $B''$, and $C''$ are collinear.

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

Solution

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See also

OIM Problems and Solutions