Question 1036820
Center (h,k), radius r, standard form cirlce equation {{{(x-h)^2+(y-k)^2=r^2}}}.  The radius is how far is any point on the circle to the center.  The DISTANCE FORMULA gives the radius, r.


{{{r=sqrt((5-1)^2+(-4-1)^2)}}}----------simplify this.