The diameter of a circle is any straight line segment that passes through the center of the circle and whose endpoints are on the circumference of the circle. The given end points of
the diameter are (-2, 4) and (4,8). Find the equation of the circle.

(x-1)^2 + (y-6)^2=-13
(x-1)^2 + (y+6)^2=13
(x-1)^2 + (y-6)^2=13
(x+1)^2 + (y-6)^2=13