Consider the equation, x2+y2−6x−4y+13−c2=0 x2+y2−4x−6y+13−c2=0 The centers of the circles are C1(3,2) and C2(2,3) and, r1=c and r2=c The two circles intersect at two points. The equation of radial axis of common chord of the circle is given as, −2x+2y=0 x−y=0 Draw C1M⊥AB