Square rstu is inscribed in circle p. given the coordinates for the vertices of the square, find the equation of circle p.
r(o, 4), s(6,2), t(4, -4), and u(-2,-2)
(x - 2)2 + y2 = 68
(x + 2)2 + y2 = 20
(x - 2)2 + y2 = 20