Uncle Li fused a conical part with a bottom radius of 2 decimeters and a height of 6 decimeters into a cylindrical part with a bottom diameter of 2 decimeters. The cylinder is zero The height of the piece is () decimeters Hurry! Help!

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• 1. A cylindrical part with a bottom radius of 1 decimeter and a height of 8 decimeters is fused into a conical part with a bottom radius of 2 decimeters and a bottom diameter of 2 decimeters What's the height of the conical part? What's the formula
• 2. A conical metal part with a circumference of 18.84 decimeters at the bottom and a height of 15 decimeters After melting, it is forged into a cylinder with the same base as it. What is the height of the cylinder
• 3. The stadium covers an area of 2000 square decimeters______ (judge right or wrong)
• 4. The perimeter of a round flower bed is about 62.8 meters. How many square meters is the area of this flower bed?
• 5. How many square decimeters is 900 square meters
• 6. The teaching building covers an area of 540 square decimeters______ (right or wrong)
• 7. A cylindrical part with a bottom radius of 4 decimeters and a height of 6 decimeters is melted into a conical part with a bottom diameter of 12 decimeters, and the height of the cone is calculated
• 8. A cylindrical part with a bottom radius of 4 decimeters and a height of 6 decimeters is fused into a conical part with a bottom diameter of 4 decimeters. How many decimeters is the height of the conical part?
• 9. A cylindrical part with a height of 12 cm is fused into a conical part with the same area as its bottom. The height of the conical part is ()
• 10. A cube iron block with an edge length of 10 cm is melted and cast into a conical iron block with a bottom diameter of 20 cm. What is the height of the conical iron block? (the number obtained keeps the whole number)
• 11. Take a cone-shaped part with a diameter of 4 decimeters and a height of 15 decimeters on the ground, and melt it into a cylinder with the same base as it. Find this It's to seek height. What's the process of getting the number.
• 12. ① Cast a cylindrical part with a bottom radius of 4 decimeters and a height of 6 decimeters into a conical part with a bottom diameter of 12 decimeters, and find out the height of the conical part
• 13. There is a conical part with a bottom diameter of 4 decimeters and a height of 15 decimeters. Now, it is fused into a cylinder with the same bottom as him. What is the height of the cylinder
• 14. What is the surface area of a conical metal part with a circumference of 18.84dm and a height of 15dm, which is melted and forged into a cylinder with the same height as its bottom?
• 15. What is the surface area of a cone-shaped part with a circumference of 18.84dm and a height of 15dm, melted into a cylinder with the same base as it
• 16. A conical metal part with a bottom circumference of 18.84 decimeters and a height of 15 decimeters is melted and forged into a cylinder with the same bottom as it. What is the surface area of the cylinder in square decimeters
• 17. Cast a cylindrical iron block with a bottom area of 6.28 square decimeters and a height of 9 decimeters into a cone with a bottom area of 12.56 square meters. What is the height of the cone How can I calculate that it's 0.015 decimeter 6.28*9=56.52（dm3） 12.56m2=1256dm2 Let the height of the cone be x decimeters 1 / 3 * 1256x = 56.52 1256x = 56.52 divided by 3 1256x=18.84 X = 18.84 divided by 1256 x=0.015 How can this be? Why do some people write 0.135 decimeters,
• 18. A cylinder iron block with a bottom area of 6.28 square decimeters and a height of 9 decimeters is melted and cast into a cone with a bottom area of 12.56 square decimeters. What is the height of the cone?
• 19. A cylindrical iron block with a bottom area of 6.28 square meters and a height of 9 decimeters is fused into a conical iron block with a bottom area of 12.56 square decimeters. How many decimeters is the height of the conical iron block
• 20. A cylindrical part with a bottom diameter of 8 decimeters and a height of 6 decimeters is fused into a conical part with a bottom diameter of 12 decimeters. What is the height of the conical part