radius of circle `x^2+y^2+z^2-2y-4z-20=0 , x+2y+2z=15`

Find the centre and radius of the circle x^(2)+y^(2)+z^(2)-2y-4z=11,x+2y+2z=15

The radius of the circle x^(2)+y^(2)+z^(2)=49,2x+3y-z-5sqrt(14)=0i

The equation of the sphere concentric with the sphere 2x^2+2y^2+2z^2-6x+2y-4z=1 and double its radius is (A) x^2+y^2+z^2-x+y-z=1 (B) x^2+y^2+z^2-6x+2y-4z=1 (C) 2x^2+2y^2+2z^2-6x+2y-4z-15=0 (D) 2x^2+2y^2+2z^2-6x+2y-4z-25=0

The radius of the sphere 3x^2+3y^2+3z^2-8x+4y+8z-15=0 is

The radius of the circle in which the sphere x^2+y^2+z^2+2x-2y-4z-19=0 is cut by the plane x+2y+2z+7=0 is

The radius of the circle in which the sphere x^2+y^2+z^2+2x-2y-4z-19=0 is cut by the plane x+2y+2z+7=0 is

The radius of the circle in which the sphere x^(2)+y^2+z^2+2z-2y-4z-19=0 is cut by the plane x+2y+2z+7=0 is a. 2 b. 3 c. 4 d. 1