The plane `x+2y-z=4` cuts the sphere `x^2+y^2+z^2-x+z-2=0` in a circle of radius (A) `sqrt(2)` (B) 2 (C) 1 (D) 3

The plane x+2y-z=4 cuts the sphere x^2+y^2+z^2-x+z-2=0 in a circle of radius (A) 3 (B) 1 (C) 2 (D) sqrt(2)

What is the radius of the sphere x^2+y^2+z^2-x-z=0 ?

What is the radius of the sphere x^2+y^2+z^2-x-y-z=0 ?

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

The radius of the sphere x^(2)+y^(2)+z^(2)=12x+4y+3z is

Show that the plane 2x-2y+z+12=0 touches the sphere x^(2)+y^(2)+z^(2)-2x-4+2z-3=0

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