A. x2+y2+gx+fy+c/2=0
B. 2(x2+y2)+gx+fy+c=0
C. 2(x2+y2+gx+fy)+3c=0
D. x2+y2+2(gx+fy+c)=0
The equation of the circle belonging to the coaxal system of which (2, -3)(0, -4) are the limiting points and passing through the point (2, -1) is
The equation of the circle passing through the points (1, 1), (2, -1), (3, 2) is
If a, b, c are the lengths of tangents from (0, 0) to the circle x2+y2-3x-4y+1=0, x2+y2+4x-6y+4=0, x2+y2-6x-12y+9=0 then the ascending order of a, b, c is
The two circles (x-a)2+(y-b)2=c and (y-b)2+x2=4c have only one real common tangent then
The locus of the point whose shortest distance from the circle x2-2x+6y-6=0 is equal to its distance from the line x-3=0 is
A=(cosθ, sinθ) and B==(sinθ, -cosθ) are two points. The locus of the centroid of ΔOAB where O is the origin is
The conjugate system of the coaxal system x2+y2+2ax+2by+2λ(ax-by)=0, λ is a parameter, is
The locus of the midpoint of the chord of the circle x2+y2-2x-2y-2=0, which makes an angle of 1200 at the centre is
Let A and B be two fixed points, If a perpendicular p is drawn from A to the polar of B with respect to the circle x2+y2=a2 and perpendicular q is drawn from B to the polar of A then
The circle x2+y2=4 cuts the circle x2+y2-2x-4=0 at the points A and B. If the circle x2+y2-4x-k=0 passes through A and B then the value of k is