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

Cone height = 4 × 4 × 3.14 × 6 ^ (6 × 6 × 3.14 × 1 / 3) = 8 decimeters

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1. 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.
2. 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!
3. 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
4. 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
5. The stadium covers an area of 2000 square decimeters______ (judge right or wrong)
6. The perimeter of a round flower bed is about 62.8 meters. How many square meters is the area of this flower bed?
7. How many square decimeters is 900 square meters
8. The teaching building covers an area of 540 square decimeters______ (right or wrong)
9. 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
10. 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?
11. 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
12. 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?
13. 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
14. 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
15. 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,
16. 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?
17. 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
18. 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
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20. A cylindrical part with a low surface radius of 1 decimeter and a height of 8 decimeters is fused into a conical part with a low surface radius of 2 decimeters. The height of the conical part is How many?