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

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• 1. 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?
• 2. 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 ()
• 3. 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)
• 4. 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)
• 5. 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
• 6. 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)
• 7. 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)
• 8. 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)
• 9. 1. The volume of a conical part is 76 cubic centimeters, and its height is 12 centimeters. How big is its bottom area? 2. A cone-shaped wheat pile has a bottom area of 12.56 square meters and a height of 1.5 meters. If each cubic meter of wheat weighs 700 kg, how many kg does the pile weigh? 3. A round tent, 4m in diameter and 3.5m in height How many square meters does the tent cover? How many cubic meters of space does it occupy? Except for the first question, I can do the rest, but I can't do it by 1 / 3 - I want to make an appointment - I can't do it - what should I do
• 10. A conical part, the bottom area is 12 square centimeters, 4.5 centimeters high, the volume of this part is () cubic centimeters
• 11. The teaching building covers an area of 540 square decimeters______ (right or wrong)
• 12. How many square decimeters is 900 square meters
• 13. The perimeter of a round flower bed is about 62.8 meters. How many square meters is the area of this flower bed?
• 14. The stadium covers an area of 2000 square decimeters______ (judge right or wrong)
• 15. 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
• 16. 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
• 17. 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!
• 18. 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.
• 19. 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
• 20. 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