Respuesta :
Center:(0,0), r=13
(x-center)^2+(y-center)^2=r^2
x^2+y^2=13^2
x^2+y^2=169
Points include: (13,0) and (0,13) among many more
(x-center)^2+(y-center)^2=r^2
x^2+y^2=13^2
x^2+y^2=169
Points include: (13,0) and (0,13) among many more