A. x2+y2+2x-4=0, 15 x2+15y2+10x+20y-48=0
B. x2+y2-4x—8y+12=0, 5 x2+5y2+4x+8y-36=0
C. x2+y2-6x-4y-9=0, 9x2+9y2-30x-20y-25=0
D. x2+y2-6x-4y+9=0, x2+y2-10x+50y-25=0
The equation of the circle passing the origin having its centre on the line x+y=4 and cutting the circle x2+y2-4x+2y+4=0 orthogonally is
The limiting points of the coaxal system x2+y2+2λx+4=0 are
The equation of the circle passing through (2, 1) and touching the coordinate axes is
The length of the tangent from the point (-1, 1) to the circle x2+y2-4x+k=0 is equal to 2 then k=
The equations of the tangents to the circle x2+y2=16 which are inclined at an angle of 600 to the x-axis is
The common chord of x2+y2-4x-4y=0 and x2+y2=16 substends at the origin an angle equal to
The conjugate line of 3x+4y-45=0 with respect to x2+y2-6x-8y+5=0 which is perpendicular to x+y=0 is
The equation of the circle having a radius 2 and passing through the limiting points of the coaxal system x2+y2-6-2λ(x+y-4)=0 is
If the lines 2x-y+11=0, x-2y+3=0 intersecting the coordinate axes in four concyclic points then the centre of the circle passing through these four points is
The equation of the circle which touch the y-axis at a distance 4 from the origin and make an intercept 6 on the x-axis is