A. 4
B. 3
C. 1
D. 2
The locus of the middle points of portions of the tangents to the circle x2+y2=a2 terminated by the axes is
If the length of the tangets from two points A, B to a circles are 6, 7 respectively. If A, B are conjugate points then AB=
The length of the tangent from a point on the circle x2+y2+2gx+2fy+c=0 to the circle x2+y2+2gx+2fy+c’=0 is
The normal of the circle(x-2)2+(y-1)2=16 which bisects the chord cut off by the line x-2y-3=0 is
The length of the common chord of the circles (x-a)2+(y-b)2=c2 and (x-b)2+(y-a)2=c2
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