Answer
13
Work Step by Step
$(x_{1},y_{1}) = (-2,6)$ and $(x_{2},y_{2}) = (3,-6)$
Then apply the distance formula ,ie,
$d = \sqrt {(x_{1}-y_{1})^{2}+(x_{2}-y_{2})^{2}}$
$d = \sqrt {(-2-3)^{2}+(6-(-6))^{2}}$
$d = \sqrt {(-5)^{2}+(12)^{2}}$
$d = \sqrt {25+144} = \sqrt {169} = 13$