A. these circles touch each other
B. one of these circles lies entirely inside the other
C. each of these circles lies outside the other
D. they intersect in two points
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
The The limiting points of the coaxal system x2+y2+2µy+9=0 are
If (2, 1 )is limiting point of the coaxal system of which x2+y2-6x-4y-3=0 is a member, then the other limiting point is
The locus of the point of intersection of two perpendicular tangents to the circle x2+y2=a2, x2+y2=b2 is
The equation of the image of the circle x2+y2-6x-4y+12=0 by the line mirror x+y-1=0 is
The inverse point of (1, 2) w.r.t the circle x2+y2=25 is (5, k), then k=