The surface area of a sphere tangent to the edges of a cube

If it is tangent to each edge, then the distance between the two opposite edges is the diameter of the circle, that is, the diagonal of any square is the diameter. There are three kinds of such topics, I can't draw a picture to help you. I can help you explain them online, thank you~~~

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1. The ratio of the surface area of a sphere tangent to each surface of a cube to that of a cube is______
2. The edge length of a square is reduced by 20%, the surface area and volume of the cube are reduced by ()%
3. The edge length ratio of the two cubes is 4:5, and the surface area ratio of the two cubes is 0______ And the volume ratio is______ ．
4. The edge length of a cube is 10 cm, and the sum of the edge length of the square is (), the surface area is (), and the volume is
5. The edge length ratio of the two cubes is 3:2. What is the surface area ratio of the two cubes? The volume ratio of the two squares is ()
6. If there is a ball in a cube whose edge length is 1 and it is tangent to all 12 edges of the cube, the volume of the ball is () Thank you
7. There are three spheres. One is tangent to each side of the cube, one is tangent to each edge of the cube, and one is too far away from each vertex of the cube
8. What is the surface area of the circumscribed sphere of a cube with four edges? 12 π or 24 π, and 32 π, 48 π It's that one
9. A cube with edge length a is inscribed with a sphere whose surface area is
10. What is the surface area of the inscribed sphere of a cube with side length 2
11. If a ball is tangent to the edges of a cube with side length a, then the surface area of the ball is? What is the situation of tangency with edge?
12. If the vertex of a cube is on the sphere and its edge length is 2cm, then the volume of the sphere is______ ．
13. If the vertices of a cube are all on the sphere and its edge length is 4cm, the volume of the sphere is equal to ⊙___ cm3
14. If every vertex of a cube with edge length a is on a sphere, the volume of the sphere is______ ．
15. Let the volume of the inscribed sphere of a cube be 32 / 3 π, then the edge length of the cube is? And it is an inscribed sphere
16. The volume of the circumscribed ball of a cube is 32 pies / 3. How about the edge length of the cube?
17. Six small cubes with 1 cm long edges are bonded to form a cuboid with the largest surface area______ The smallest is______ ．
18. A cuboid is made up of 12 cuboids whose edges are 1 cm long. What is the maximum surface area and the minimum surface area of the cuboid
19. Volume formula of cuboid, cube, cylinder, cone and sphere
20. How to find a cube, a cuboid, a cylinder, a cone, tell the volume, how much the surface area increases with a knife? Or cut a knife, what is his surface area and volume? Hurry! Please tell me the calculation formula and method! 30 minutes can solve, I give 150 wealth value!