Question 951654
The radius is the distance from center (4,-2) to the given point (-4,13) on the circle.  Use the distance formula to find this.


In raw form according to Standard Form equation for a circle,
{{{(x-4)^2+(y-(-2))^2=(sqrt((4-(-4))^2+(-2-13)^2))^2}}};
Simplify this and you have your needed result.