Trigonometry
(x−4)2+(y+4)2=4\(\left\)(x-4\(\right\))^2+\(\left\)(y+4\(\right\))^2=4
(x−4)2+(y+4)2=16\(\left\)(x-4\(\right\))^2+\(\left\)(y+4\(\right\))^2=16
(x+4)2+(y−4)2=16\(\left\)(x+4\(\right\))^2+\(\left\)(y-4\(\right\))^2=16
(x+4)2+(y−4)2=4\(\left\)(x+4\(\right\))^2+\(\left\)(y-4\(\right\))^2=4