If (-4,-2) and (2,6) are opposite points on a circle, what is the equation of the circle?
the midpoint (-1,2) is the center (h,k)
(x - h)^2 + (y - k)^2 = r^2
half the distance between the points is the radius , r
(x - h)^2 + (y - k)^2 = r^2
half the distance between the points is the radius , r