A. x2+y2=a
B. x2+y2=b
C. x2+y2=ab
D. x2+y2=a2+b2
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
The point diametrically opposite to the point P(1, 0) on the circle x2+y2+2x+4y-3=0 is
If the lines 3x + 4y - 14 = 0 and 6x + 8y + 7 = 0 are both tangents to a circle, then its radius is
The locus of the point which moves such that the sum of the squares of its distance from (0, a) is 2r2, is