A. 8

B. 12

C. 16

D. 32

The length of the tangent from a point on the circle x^{2}+y^{2}+4x-6y-12=0 to the circle x^{2}+y^{2}+4x-6y+4=0 is

The foot of the perpendicular from (0, 2, 3) to the line (x+3)/5 = (y-1)/2 = (z+4)/3 is:

A: The angle between the tangents drawn from origin to the circle x^{2}+y^{2}-14x+2y+25=0 is π/2

R: If θ is the angle between the pair of tangents drawn from (x_{1}, y_{1}) to the circle S=0 of radius r then tanθ/2=r/√S_{11}

A: The equation of the common chord of the two circles x^{2}+y^{2}+2x+3y+1=0, x^{2}+y^{2}+4x+3y+2=0 is 2x+1=0

R: If two circles intersect at two points then their common chord is the radical axis

The equation of the circle which bisects the circumference of the circle x^{2}+y^{2}=1, x^{2}+y^{2}+2x=3, x^{2}+y^{2}+2y=3 is