Question 139672
The equation of a circle with center at (h,k) and radius r is {{{(x-h)^2+(y-k)^2=r^2}}}


So:

{{{(x-1)^2+(y-(-5))^2=2.5^2}}}


{{{(x-1)^2+(y+5)^2=6.25}}}


Or if you feel like expanding it:


{{{x^2-2x+1+y^2+10y+25-6.25=0}}}


{{{x^2+y^2-2x+10y+19.75=0}}} putting it in {{{Ax^2+By^2+Cx+Dy+E=0}}} form