A 3 meter long round steel is cut into three sections, and the surface area is increased by 12.56 square decimeters

3 M = 30 decimeter, 12.56 △ 4 × 30 = 3.14 × 30 = 94.2 (cubic decimeter); answer: the volume of round steel is 94.2 cubic decimeter

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1. A 3 meter long round steel is cut into three sections, and the surface area is increased by 12.56 square decimeters
2. 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
3. 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?
4. A rectangular paper can just make a cylinder, the length of the rectangle is 20.56 cm
5. Use a 20 cm long, 12 cm wide rectangular paper to form a cylinder. The volume of the cylinder is () cubic cm at most
6. 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)
7. 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
8. 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
9. 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?
10. 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!
11. A round steel 1.2m, sawed into two sections of 0.6m, surface area plus 12.56m2, calculate the volume of round steel
12. A 3 meter long round steel is cut into three sections, and the surface area is increased by 12.56 square decimeters
13. 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
14. 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
15. 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
16. 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
17. A cylinder has a surface area of 408.2 square decimeters and a radius of 5 decimeters. How many square decimeters is the volume of the cylinder?
18. The surface area of a cylinder is 18.84 square decimeters, and the diameter of its bottom is 2 decimeters
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20. The surface area of a cylinder is 156.52 square meters, and the side area is 100 square meters. What is the radius of the bottom of each cylinder? real