A rectangular paper can just make a cylinder, the length of the rectangle is 20.56 cm

That is, the cross-sectional area of the cylinder is: 12.56/2 = 6.28 square centimeter, 1 meter = 100 centimeter, and the volume of raw wood is: 6.28 * 100 = 628 cubic centimeter

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1. Use a 20 cm long, 12 cm wide rectangular paper to form a cylinder. The volume of the cylinder is () cubic cm at most
2. Roll a piece of rectangular paper 12.56 cm long and 6.28 cm wide into the largest cylinder. What is the volume of the cylinder in cubic centimeter? (excluding joints)
3. As shown in the figure, the height of a cylinder is 8 cm. If its height is increased by 2 cm, its surface area will increase by 25.12 square cm. The volume of the original cylinder is 2 cm______ Cubic centimeter
4. After the side of a cylinder is expanded, a square with side length of 12.56 cm is obtained. What are the surface area and volume of the original cylinder
5. For a 2-meter-long cylindrical wood, after cutting off a 2-decimeter-long cylindrical block, the surface area is reduced by 12.56 square decimeters. What is the volume of the original wood?
6. The side view of a cylinder is a square. The area of the square is 942 square decimeters. What is the surface area of the cylinder? We need the formula!
7. The circumference and height of the bottom surface of a cylinder are equal. If the height is shortened by 2 cm, the surface area will be reduced by 12.56 square cm. Find the surface area of the cylinder
8. If the radius of the bottom of a cylinder increases by 2 cm, its side area will increase by 62.8 square meters. If the perimeter of its bottom increases by 2 cm, how many square centimeters will its side area increase?
9. If the radius of the bottom of a cylinder increases by 4cm, its side area will increase by 125.6cm. If the perimeter of the bottom increases by 3cm, how much will its side area increase?
10. If the height of the cylinder is equal to the circumference of the bottom, then the side view of the cylinder is a square
11. Use a piece of square paper 12.56 cm long and 8 decimeters wide to form a cylinder. What is the volume of the cylinder?
12. Roll a rectangular piece of paper 12.56 cm long and 9.42 cm wide into a cylinder. The volume of the cylinder is______ Cubic centimeter or______ Cubic centimeter
13. A 3 meter long round steel is cut into three sections, and the surface area is increased by 12.56 square decimeters
14. A 3 meter long round steel is cut into three sections, and the surface area is increased by 12.56 square decimeters
15. A round steel 1.2m, sawed into two sections of 0.6m, surface area plus 12.56m2, calculate the volume of round steel
16. A 3 meter long round steel is cut into three sections, and the surface area is increased by 12.56 square decimeters
17. 2 meters of cylindrical steel, cut into four small columns, the surface area than the original increased by 56.52 square centimeters. The volume of this cylindrical steel is () cubic centimeters
18. As shown in the figure on the right, a 4-meter-long cylindrical steel is cut into two sections on average. The surface area is increased by 12.56 square centimeters, and the volume of each section of steel is several cubic centimeters Pay attention to the unit
19. A 1.5-meter-long cylinder is sawed into four identical cylinders, and the surface area increases by 56.52 square decimeters. What is the original volume of the cylinder
20. After sawing a 2-meter-long cylinder into three small cylinders, the total surface area of the cylinder increases by 12.56 square decimeters. The original volume of the cylinder is______ Cubic decimeter