A. x2+y2=l2

B. x2+y2=r2-l2

C. x2+y2=r2+l2

D. x2+y2=4l2

Consider the circles x^{2}+(y-1)^{2}=9, (x-1)^{2}+y^{2}=25. They are such that

The parametric equations of circle x^{2}+y^{2}+8x-6y=0 are

The centre of the circle passing through the points (a, b), (a, -b), (a+b, a-b) is

The point diametrically opposite to the point P(1, 0) on the circle x^{2}+y^{2}+2x+4y-3=0 is

If the lines 3x + 4y - 14 = 0 and 6x + 8y + 7 = 0 are both tangents to a circle, then its radius is