A. √4c2-2(a-b)2
B. √4c2-(a-b)2
C. √2c2-2(a-b)2
D. √c2-(a-b)2
The external centre of similitude of the two circles x2+y2-2x-6y+9=0, x2+y2=4 is
The longest distance from (-3, 2) to the circles x2+y2-2x+2y+1=0 is
If the equation of the circle passing through the origin and the points of intersection of the two circles x2+y2-4x-6y-3=0, x2+y2+4x-2y-4=0 is x2+y2+2ax+2by+c=0 then the ascending order of a, b,c is
The circle passing through the points (1, t), (t, 1) and (t, t) for all values of t passes through the point
The equation of the circle passing through the points of intersection of the circles x2+y2+2x+3y+1=0, x2+y2+4x+3y+2=0 and through the point (-1, 2)is
The two circles x2+y2+2ax+2by+c=0 and x2+y2+2bx+2ay+c=0 have three real common tangents, then
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=