A. 4h

B. 3h

C. 2h

D. h

The system of circle x^{2}+y^{2}+2λx-5=0 is

The equation of the tangent to the circle x^{2}+y^{2}-2x-4y+3=0 at (2, 3) is

The equation of the circle with centre (3, -2) and radius 3 is

The circles x^{2}+y^{2}-10x+16=0 and x^{2}+y^{2}=r^{2} intersect each other into distinct points if

The centre of the circle passing through the points (0, 0), (1, 0) and touching the circle x^{2}+y^{2}=9 is