A. (a+b)2=2c
B. (a-b)2=2c
C. a+b+c=0
D. none
The points (4, -2), (3, b) are conjugate w.r.t x2+y2=24 if b=
The equation of the common chord of the two circles (x-a)2+(y-b)2=c2, (x-b)2+(y-a)2=c2 is
The circumcircle of a triangle is given by x2+y2-4x+6y-3=0. The radius of the nine point circle of the triangle is
The line x cosα+y sinα=p touches the circle x2+y2-2axcosα-2aysinα=0, then p=
The locus of the centre of circle which touches the line x cos α+y sin α=p and circle (x-a)2+(y-b)2=c2 is
The distance between the limiting points of the coaxial system x2 + y2 – 4x – 2y – 4 + 2λ(3x + 4y + 10)=0
If x2+y2-4x+6y+c=0 represents a circle radius 5 then c=
The equation of the circle cutting orthogonally the circles x2+y2-8x-2y+16=0, x2+y2-4x-4y-1=0 and passing through the point (1, 1) is
If x2+y2+2gx+2fy+9=0 represents a circle with centre (1, -3) then radius=
The number of common tangents to the two circles x2+y2-8x+2y=0 and x2+y2-2x-16y+25=0 is