A. 15 sq. unit

B. 20 sq. unit

C. 24 sq. unit

D. 45 sq .unit

The circles x^{2}+y^{2}=1 , x^{2}+y^{2}+6x-2y=1 and x^{2}+y^{2}-12x+4y=1 are such that

The polar of the point (1, -2) w.r.t the circles x^{2}+y^{2}+6y+5=0 , x^{2}+y^{2}+2x+8y+5=0 are

The number of common tangents to the two circles x^{2}+y^{2}=4, x^{2}+y^{2}-8x+12=0 is

If (2, 6) is a centre of similitude for the-circles x^{2}+y^{2}=4 and x^{2}+y^{2}-2x-6y+9=0, the length of the common tangent of circles through it is

The radical axis of co-axial system of circle with the limiting points (1, 2) and (4, 3) is given by in equation