The surface area of a cylinder is 339.12 square centimeters, and the radius of its bottom is 3 centimeters @##￥%…… &%*…… （*&）（*（&*&%………… %￥%#￥@#!

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• 1. When a 12 cm long cylinder is cut 5 cm thick, the surface area of the cylinder is reduced by 31.4 square centimeters. How many square centimeters is the original surface area of the cylinder?
• 2. The circumference of the bottom surface of a cylinder is 25.12 cm, and its height is 9. How many cubic centimeters is its volume? It is a cone with the same height as the bottom of the cylinder
• 3. Cut a cylinder with a bottom area of 28.26 square cm and a height of 8 cm into the largest cone. What is the volume of the cone in square cm? Cut it off (┬＿┬)
• 4. A cylinder and a cone have the same base area and height. The volume of a cone is 18 times less than that of a cylinder
• 5. The bottom area and volume of a cylinder and a cone are equal. If the cone is 18 meters high, how many meters is the cylinder high Completion
• 6. For a cylinder and a cone, the ratio of the circumference of the bottom surface is 2:3, the ratio of their volume is 5:6, and the simplest integer ratio of the height of the cone and the cylinder is () A. 54:23B. 54:2C. 15:8D. 8:5
• 7. The diameter of the bottom surface of a cylinder and a cone is equal, and the height of the cone is 2 / 3 of that of the cylinder. If the volume of the cylinder is 54 cubic centimeters, calculate the volume of the cone
• 8. A cylinder has a side area of 942 square centimeters and a volume of 2355 cubic centimeters. How many centimeters is its bottom radius?
• 9. The side area of a cylinder is 942 square centimeter and its volume is 2355 cubic centimeter
• 10. A rectangular sheet of iron is 20 cm long and 6.28 cm wide. Taking it as the side of a cylinder, what is the maximum volume of the cylinder?
• 11. Expand the side of a cylinder to get a square. It is known that the bottom area of the cylinder is 20 square centimeters. What is the surface area of the cylinder?
• 12. The side view of a cylinder is square. The ratio of diameter to height of the bottom of the cylinder is () A. 2π：1B. 1：1C. 1：πD. π：1
• 13. If the radius of the bottom of a cylinder increases by 5 cm, its side area will increase by 125.6 square cm. If the perimeter of the bottom increases by 4 cm, how many square cm will its side area increase?
• 14. The circumference of the bottom surface is 12.56 meters and the height is 6 meters
• 15. What are the surface area and volume of a cylinder with a bottom radius of 1 decimeter and a square with its side expanded? As long as the first answer, give a reward, but I'm new here, by the way, tell me what 28.26x15 is equal to
• 16. The surface area of a cylinder is 12.56 square centimeters more than its side area. The height of a cylinder is 5 centimeters. What is its volume? I'm sorry. I can do it. I've got a brain connection
• 17. 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? The perimeter of the bottom surface of a cone-shaped grain pile is 9.42 meters and the height is 2.7 meters. If it is installed in a cone-shaped beam with a bottom radius of 1 meter, how high can it be piled?
• 18. Xiao Hong takes a rectangular piece of paper, 20 cm in length and 3 / 5 in width, and uses it to form a cylinder. What is the volume of the cylinder?
• 19. 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
• 20. The length of a round steel is 1.2, now it is sawed into two small sections with each section of 0.6 meters long, and the surface area is increased by 12.56 square centimeters