A. x2+y2+2x-4y-47=0

B. x2+y2=49

C. x2+y2-2x+2y-47=0

D. x2+y2=17

The centre of the circle x^{2}+y^{2}-4x-2y-4=0 is

If the two circles (x-2)^{2}+(y-3)^{2}=r^{2}and x^{2}+y^{2}-10x+2y+17=0 intersect in two distrinct points then

The limiting points of coaxal system x^{2}+y^{2}+11x-5y-2+λ(x-y-1)=0 is

The equation of the circle passing through the point of intersection of the circles x^{2}+y^{2}-3x-6y+8=0, x^{2}+y^{2}-2x-4y+4=0 and touching the line x+2v=5 is

If the two circle x^{2}+y^{2}+2gx+c=0 and x^{2}+y^{2}-2fy-c=0 have equal radius then locus of (g, f) is