If the vertex of a cube is on the sphere and its edge length is 2cm, then the volume of the sphere is______ .

If the vertex of a cube is on the sphere and its edge length is 2cm, then the volume of the sphere is______ .

Because the vertices of a cube are on the sphere, and its edge length is 2cm, the diameter of the circumscribed sphere of the cube is the length of the diagonal of the cube: 23. So the radius of the sphere is: 3. The volume of the sphere is: 4 π 3 (3) 3 = 43 π. So the answer is: 43 π