A. a circle of radius 2
B. a circle of radius 4
C. a circle of radius3
D. none
The locus of the poles of the line 2x-3y-4=0 w.r.t the circle x2+y2+2λx-16=0 is
Let AB be the chord 4x-3y +5 = 0 with respect to the circle x2+y2-2x+4y-20=0. If C= (7, 1), then the area of the triangle ABC is
The circles x2+y2=1 , x2+y2+6x-2y=1 and x2+y2-12x+4y=1 are such that
The polar of the point (1, -2) w.r.t the circles x2+y2+6y+5=0 , x2+y2+2x+8y+5=0 are
The number of common tangents to the two circles x2+y2=4, x2+y2-8x+12=0 is
If (2, 6) is a centre of similitude for the-circles x2+y2=4 and x2+y2-2x-6y+9=0, the length of the common tangent of circles through it is
The radical axis of co-axial system of circle with the limiting points (1, 2) and (4, 3) is given by in equation
A tangent at a point on the circle x2+y2=a2 intersects a concentric circle S at P and Q. The tangents to S at P and Q meet on the circle x2+y2=b2. The equation to the circle S is
If (1, a), (b, 2) are conjugate points with respect to the circle x2+y2=25, then 4a+2b=
The equation of the circle cutting orthogonally circles x2+y2-4x+3y-1=0 and passing through the points (-2, 5), (0, 0) is