(x-h)^2+(y-k)^2=r^2 center is (h,k) radius is r means that ny point, r units from (h,k) is on it means that the points (h+r,k) and (h-r,k) and (h,k+r) and (h,k-r) are defenitely on the circle
given (x-2)^2+(y-(-3))^2=2^2 center is (2,-3) radius is 2
points on it are (4,-3) and (0,-3) and (2,-1) and (2,-5) there are more, but these are 4 that are defenitely on it
