A. √c-c1

B. √c+c1

C. √c1-c

D. c-c1

The normal of the circle(x-2)^{2}+(y-1)^{2}=16 which bisects the chord cut off by the line x-2y-3=0 is

The length of the common chord of the circles (x-a)^{2}+(y-b)^{2}=c^{2} and (x-b)^{2}+(y-a)^{2}=c^{2}

The external centre of similitude of the two circles x^{2}+y^{2}-2x-6y+9=0, x^{2}+y^{2}=4 is

The longest distance from (-3, 2) to the circles x^{2}+y^{2}-2x+2y+1=0 is

If the equation of the circle passing through the origin and the points of intersection of the two circles x^{2}+y^{2}-4x-6y-3=0, x^{2}+y^{2}+4x-2y-4=0 is x^{2}+y^{2}+2ax+2by+c=0 then the ascending order of a, b,c is