The radius of the circle `(1+m^(2))(x^(2)+y^(2))-2cx-2cmy=0" is "`

The centre of the circle (1+m^(2)) (x^(2)+y^(2))-2cx-2cmy =0" is "

The centre and radius of the circle (1+m^(2))*(x^(2)+y^(2))-2ax-2amy=0 is

The radius of the circle sqrt(1 + a^(2)) (x^(2) + y^(2)) - 2bx - 2aby = 0 is

The radius of circle having centre at (2,1) and whose on of the chord is diameter of the circle x^(2)+y^(2)-2x-6y+6=0 is

If one of the diameters of the circle x^(2)+y^(2)-2x-6y+6=0 is a chord to the circle with center (2,1) ,then the radius of the circle is

If one of the diameters of the circle x^(2)+y^(2)-2x-6y+6=0 is a chord to the circle with centre (2,1), then the radius of circle is:

The radius centre of the circles x^(2)+y^(2)=1,x^(2)+y^(2)+10y+24=0andx^(2)+y^(2)-8x+15=0 is

Find the centre and radius of the circle 3x^(2)+(a+1)y^(2)+6x-9y+a+4=0 .