The stadium covers an area of 2000 square decimeters______ (judge right or wrong)

The floor area of the stadium is 2000 square meters. It is wrong that the floor area of the stadium is 2000 square decimeters

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1. The perimeter of a round flower bed is about 62.8 meters. How many square meters is the area of this flower bed?
2. How many square decimeters is 900 square meters
3. The teaching building covers an area of 540 square decimeters______ (right or wrong)
4. 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
5. 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?
6. 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 ()
7. 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)
8. For an iron machine part, the upper part is conical and the lower part is cylindrical. The area of the bottom is equal. The height of the cone is twice that of the cylinder. The volume of the cone is known to be 9.42 cubic decimeters. The total weight of the part can be calculated. (iron weight per cubic decimeter is 7.8kg)
9. The volume of a 282.6 cubic centimeter iron block is fused into a 9cm high cone-shaped machine part. How much is the bottom area of the cone-shaped part? A cylinder with a radius of 4cm and a height of 10cm is remelted into a cone with a radius of 2cm. What is its height? Answer in 20 minutes
10. Cast a 282.6 cubic centimeter iron block into a conical machine part with a bottom radius of 6cm, and calculate the height of the conical part? (π = 3.14)
11. 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
12. 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
13. 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!
14. 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.
15. 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
16. 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
17. 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?
18. 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
19. 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
20. 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,