Centre of the circle whose radius is 3 and which touches internally the circle `x^(2)+y^(2)-4x-6y-12=0` at the point (-1 -1) is

Find the equation of the circle whose radius is 5a n d which touches the circle x^2+y^2-2x-4y-20=0 externally at the point (5,5)dot

Find the equation of the circles whose radius is 4 and whish is concentric with the circle x^(2)+y^(2)+2x-6y=0

The equation of the cirele which passes through the point (1, 1) and touches the circle x^2+y^2+4x-6y-3=0 at the point (2, 3) on it is

Co-ordinates of the centre of a circle, whose radius is 2 unit and which touches the pair of lines ines x^2-y^2-2x + 1 = 0 is (are)

The locus of the centre of a circle which touches externally the circle x^2 + y^2-6x-6y+14 = 0 and also touches Y-axis, is given by the equation (a) x^2-6x-10y+14 = 0 (b) x^2-10x-6y + 14 = 0 (c) y^2+6x-10y+14-0 (d) y^2-10x-6y + 14 = 0

Find the centre and radius of circles. x^(2)+y^(2)-8x+10y-12=0 .

Find the centre and radius of circles. x^(2)+y^(2)-4x-8y-45=0 .

Find the equation of the normals to the circle x^2+y^2-8x-2y+12=0 at the point whose ordinate is -1

Find the equation of the circle having radius 5 and which touches line 3x+4y-11=0 at point (1, 2).

lf a circle C passing through (4,0) touches the circle x^2 + y^2 + 4x-6y-12 = 0 externally at a point (1, -1), then the radius of the circle C is :-