A. (-5, -9)
B. (-9, -15)
C. (-5/2, -9/2)
D. none
If x2+y2+6x+2ky+25=0 touches the y-axis then k=
Equation of the circle passing through (2, 0) and whose radical axis w. r. to the circle x2+y2=1 is at x=1/2 is
If the tangent from a point P to the circle x2+y2=1 is perpendicular to the tangent from P to the circle x2+y2=3, then the locus of P is
The locus of the poles of the line 2x-3y-4=0 w.r.t the circle x2+y2+2λx-16=0 is
Let AB be the chord 4x-3y +5 = 0 with respect to the circle x2+y2-2x+4y-20=0. If C= (7, 1), then the area of the triangle ABC is
The circles x2+y2=1 , x2+y2+6x-2y=1 and x2+y2-12x+4y=1 are such that
The polar of the point (1, -2) w.r.t the circles x2+y2+6y+5=0 , x2+y2+2x+8y+5=0 are
The number of common tangents to the two circles x2+y2=4, x2+y2-8x+12=0 is
If (2, 6) is a centre of similitude for the-circles x2+y2=4 and x2+y2-2x-6y+9=0, the length of the common tangent of circles through it is
The radical axis of co-axial system of circle with the limiting points (1, 2) and (4, 3) is given by in equation