The diameter of the bottom of a circular fountain is 8 meters. How many cubic meters of circular concrete are built along the periphery of the fountain, which is 1 meter wide and 20 cm thick? Urgent, as the title

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• 1. Star square has designed a cylindrical fountain with a bottom diameter of 40 meters and a depth of 1 meter. (1) if tiles are laid around and at the bottom of the fountain, how many square meters of tiles are needed? If every liter of water weighs 1kg, how many tons can the pool hold?
• 2. Street garden to build a cylindrical fountain, the bottom diameter is 10 meters, 1 meter deep, in the fountain bottom and inner wall plastered with cement, plastering cement part of the area is
• 3. In the center of a primary school, there is a circular fountain with a diameter of 8 meters and a depth of 0.6 meters ① There are 10 cone-shaped stones in the fountain to install the nozzle. The bottom radius of each stone is 3 decimeters and the height is 4 decimeters. Please calculate the space occupied by these stones ② To make the nozzle spray water normally, it is necessary to put 0.5m deep water into the pool. What is the volume of water? ③ If you want to build a 1 meter wide circular road on the edge of the pool, how many square meters is the area of this road?
• 4. Xianjing park has a circular fountain with a diameter of 12 meters. There is a circle of stainless steel guardrail 0.5 meters outside the fountain. What is the minimum length of the guardrail If you want to work out the formula, you have to say the truth
• 5. Xianjing park has a circular fountain with a diameter of 12 meters. There is a circle of stainless steel guardrail 0.5 meters outside the fountain. How long is the guardrail at least?
• 6. There is a circular fountain in a park. The perimeter of the fountain is 75.36 meters. What's its diameter?
• 7. There is a cylindrical fountain in the school. The diameter of the bottom of the fountain is 8 meters. It can hold 25.12 cubic meters of water at most. How deep is the fountain?
• 8. There is a cylindrical fountain in a park. The bottom area of the fountain is 6m in diameter. It can hold 18.84 cubic meters at most. What is the depth of the fountain
• 9. The school builds a round fountain with a volume of 37.68 cubic meters and a diameter of 4 meters A. 2B. 3C. 0.6D. 5
• 10. The school builds a round fountain with a volume of 37.68 cubic meters and a diameter of 4 meters A. 2B. 3C. 0.6D. 5
• 11. Square to build a cylindrical shape of the pool, the pool wall and bottom to paste tiles. Pool bottom diameter 28 meters, pool depth 1.2 meters, paste the area of how many square meters?
• 12. To build a cylindrical fountain pool in the public square, porcelain weights should be pasted on the wall and bottom of the pool. The diameter of the pool bottom is 28 meters, and the depth of the pool is 1.2 meters. What is the area of tile
• 13. To build a cylindrical fountain pool in the public square, tiles should be pasted on the wall and bottom of the pool. The diameter of the pool bottom is 30 meters and the depth of the pool is 1.2 meters. What is the area of tiles
• 14. A round pool, 28.26 meters in circumference, its area is______ Square meters
• 15. There is a circular flower bed, its perimeter is 18.84 meters, what is the floor area of this flower bed?
• 16. The perimeter of a circular nursery measured from the outside is 18.84 meters. How many square meters does the nursery cover?
• 17. There is a circular fountain in the park, with a circumference of 31.4 meters. What is the area of the fountain?
• 18. The perimeter of a circular reservoir is 25.12m. What is the floor area of the reservoir?
• 19. The perimeter of a circular reservoir is 125.6 meters. What is the floor area of this graphic reservoir
• 20. There is a circular fountain in the park, with a circumference of 31.4 meters. What is the area of the fountain?