A. g2+f2+c=0

B. g2+f2=c

C. g2+f2=2c

D. 2(g2+f2)=c

The equation of the chord of the circle x^{2}+y^{2}+16x+2y+10=0 parallel to the chord x-3y-15=0 and which is at the same distance from the centre is

If the tangent to the circle x^{2}+y^{2}=5 at (1, -2) also touches the circle x^{2}+y^{2}-8x+6y+20=0, then the point of contact is

The radical centre of the circle x^{2}+y^{2}+a_{r}x+b_{r }y+c=0, r=1, 2, 3 is

The equation of the circle cutting the circle x^{2}+y^{2}+2x-4y+8=0 orthogonally and coaxial with the circle x^{2}+y^{2}+6x-4y-12=0, x^{2}+y^{2}-4x-6y-12=0 is

The inverse point of (1, -1) with resapect to the circle x^{2}+y^{2}=4 is