If (-1,3)and (5, 1) are two endpoints of a diameter of a circle, what is the equation of the circle?
Center is in between the points @ 2,2
diameter is distance between @ sqrt( (5- -1)^2 + (1-3)^2) ) = sqrt40
Stadard equation of a circle becomes (x-2)^2 + (y-2)^2 = 40
