A. 1
B. 2
C. 3
D. 4
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
If the points (k, 1), (2, -3) are conjugate w.r.t x2+y2+4x-6y-12=0 then k=
The equation to the locus of the midpoint of the chords of the circle x2+y2=r2 having a constant length 2l is
Consider the circles x2+(y-1)2=9, (x-1)2+y2=25. They are such that
The parametric equations of circle x2+y2+8x-6y=0 are
The centre of the circle passing through the points (a, b), (a, -b), (a+b, a-b) is