The centre of the smallest circle touching the circles `x^2+ y^2-2y -3=0` and `x^2 +y^ 2-8x -18y +93= 0` is:

Find the sum of co-ordinates of the centre of the smallest circle touching the circles x^(2)+y^(2)-2y-3=0 and x^(2)+y^(2)-6x-18y+93=0

Coordinates of the centre of the circle which bisects the circumferences of the circles x^2 + y^2 = 1; x^2 + y^2 + 2x - 3 = 0 and x^2 + y^2 + 2y-3 = 0 is

The centres of those circles which touch the circle x^(2) + y^(2) - 8x - 8 y - 4 = 0 externally and also touch the x - axis, lie on

The centres of those circles which touch the circle x^(2) + y^(2) - 8x - 8 y - 4 = 0 externally and also touch the x - axis, lie on

Find the locus of the centre of the circle touching the line x+2y=0a n d x=2y

Find the equation of the circle which cuts the circles x^2+y^2+4x+2y+1=0, 2(x^2+y^2)+8x+6y-3=0 and x^2+y^2+6x-2y-3=0 orthogonally.