# Excenters and incenter of a triangle

Geometry Level pending

${\rm{A}}\left( { - {\rm{1}},{\rm{ 3}}} \right),{\rm{ B}}\left( {{\rm{1}},{\rm{ 5}}} \right)$ are two excenters of a triangle PQR and the remaining excenter C lies on the circle $${x^2} + {y^2} - 6x - 2y - 10 = 0$$ then the locus of the incenter of triangle PQR is a circle. Find its radius

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