A. p=2, q=-7
B. p=-2, q=7
C. p=-2, q=-7
D. p=2, q=7
For the circles x2+y2+4x+2y-4=0, x2+y2-4x-2y+4=0 the line 3x+4y-5=0 is a
The locus of midpoints of the chord of the circle x2+y2 = 25 which pass through a fixed point (4, 6) is a circle. The radius of that circle is
If one end of the diameter of the circle x2+y2-6x+4y-12=0 is (7, -5), then the other end of the diameter is
Polar of the origin w.r.t the circle x2+y2+2ax+2by+c=0 touches the circle x2+y2=r2 if
The circle orthogonal to the three circles x2+y2+aix+biy+c=0, i=1, 2, 3 is
The coaxal system having limiting points (2,3), (-3, 2) is
If the two circles (x-1)2+(y-3)2=r2 and x2+y2-8x+2y+8=0 intersect in two distinct points, then
The pole of a straight line with respect to the circle x2+y2=a2 lies on the circle x2+y2=9a2. If the straight line touches the circle x2+y2=r2, then
P(-2, -1) and (0, -3) are the limiting points of a coaxal system of which C= x2+y2+5x+y+4=0 is a member. The circle S= x2+y2-4x-2y-15=0 is orthogonal to the circle C. The point where the polar P cuts the circle S is
A tangent to the circle x2+y2=4 meets the coordinate axes at P and Q. The locus of mindpoint of PQ is