(x−h)2+(y−k)2=h2(x-h)^{2}+(y-k)^{2}=h^{2}(x−h)2+(y−k)2=h2
(x−h)2+(y−k)2=k2(x-h)^{2}+(y-k)^{2}=k^{2}(x−h)2+(y−k)2=k2
(x+h)2+(y˙+k)2=h2(x+h)^{2}+(\dot{y}+k)^{2}=h^{2}(x+h)2+(y˙+k)2=h2
(x+h)2+(y+k)2=k2(x+h)^{2}+(y+k)^{2}=k^{2}(x+h)2+(y+k)2=k2