Question

Give the equation for a circle with the given center and radius. Center at (2, -9), radius = 3

Answer 1

In standard form, the equation is $(x-2)^2+(y+9)^2=9,$ where we have plugged $(h,k,r)=(2,-9,3)$ into the standard-form equation $(x-h)^2+(y-k)^2=r^2.$ The center of this general form has coordinates $(h,k),$ and the radius is $r.$

Answer 2

The correct equation is (x-2)^2+(y+9)=9