The length of the common chord of the circles
` x^(2) + y^(2) + 2gx + c = 0` and `x^(2) + y^(2) + 2fy - c = 0 ` is

The length of common chord of the circles x^2 + y^2 - 6x - 4y + 13 - c^2 = 0 and x^2 + y^2 -4x - 6y + 13 -c^2 = 0 is

The length of the common chord of the circles x^2+y^2+ax+by+c=0 and x^2+y^2+bx+ay+c=0 is

The length of the common chord of the circles x^2+y^2+ax+by+c=0 and x^2+y^2+bx+ay+c=0 is

The length of the common chord of the circles (x - a)^(2) + (y - b)^(2) =c^2" and " (x -b)^(2) + (y -a)^(2) = c^(2) = c^(2) is

The length of the tangent drawn from any point on the circle x^(2) + y^(2) + 2gx + 2fy + a =0 to the circle x^(2) + y^(2) + 2gx + 2fy + b = 0 is

If the origin lies inside the circle x^(2) + y^(2) + 2gx + 2fy + c = 0 , then

The length of the tangent from to the circle x^(2)+y^(2)+2gx+2fy+c=0 to the circle x^(2)+y^(2)+2gx+2fy+c’=0 is

Find the parametric representation of circles : (i) x^(2) + y^(2) + 12x - 4y - 1 = 0 (ii) x^(2) + y^(2) + 2gx + 2fy + c = 0 .