Find the equation of the circle centered at (2,2) and passing through (4,5).
Actually, all we need to do here is to find the radius ^2.....this is
[ (4 - 2)^2 + ( 5 -2)^2 ] = [ 2^2 + 3^2 ] = 13
So.......the equation is
( x - 2)^2 + (y - 2)^2 = 13
