Find the radius of the circle `x^2 + y^2 - 4x - 2y - 11 = 0`.

Find the radius of the circle x^(2)+y^(2)-4x-6y+12=0

Find the centre and radius of the circle : x^2 + y^2- 4x- 8y- 45 = 0 .

In the following, find the centre and radius of the circles.:- x^2 + y^2 -4x -8y -45 = 0

In the following, find the centre and radius of the circles.:- x^2 + y^2 -8x + 10y - 12 = 0

The radius of the circle : x^2 + y^2-8x + 10y- 12 =0 is:

Find the centre and radius of the circle : x^2 + y^2- 8x+ 10y- 12 = 0 .

Find the centre and radius of the circle : x^2 + y^2+ 8x + 10y- 8 =0 .

Find the equation of the circle passing through the points of intersection of the circles x^2 + y^2 - 2x - 4y - 4 = 0 and x^2 + y^2 - 10x - 12y +40 = 0 and whose radius is 4.

Find the centre and radius of the circle : 2x^2 + 2y^2- x=0 .

In the following, find the centre and radius of the circles.:- 2x^2 + 2y^2 -x = 0