Answer
Center: $(4,5)$
Radius: $r=6$
Work Step by Step
The equation of a circle in standard form:
$(x-h)^2+(y-k)^2=r^2$ in which $(h,k)$ is the center and $r$ is the radius
$(x-4)^2+(y-5)^2=36$
$(x-4)^2+(y-5)^2=6^2$
Center: $(4,5)$
Radius: $r=6$