A cylindrical part with a bottom radius of 1 decimeter and a height of 2 decimeters is forged into a cuboid with a height of 4 decimeters, and the area of the cuboid is calculated

Only the bottom area of the cuboid can be obtained

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1. A rectangular iron block with a base area of 64 square centimeters and a height of 4 centimeters is forged into a rectangle with a square section The side length of the cross section is 5cm. What is the length of the forged cuboid [the loss is ignored]
2. A rectangular billet with a bottom area of 12.56 cm and a height of 8 cm is forged into a cylindrical part with a bottom radius of 3 cm. The length of the cylindrical part is calculated
3. How long is a cube steel with an edge length of 20 cm forged into a cube steel with a bottom area of 16 square cm? This problem is for you in the second semester of the fifth grade
4. A cube steel embryo with 20 cm edge length is forged into a cuboid steel with 16 square cm bottom area. How high is the cuboid steel?
5. A square steel slab with an edge length of 20 cm is forged into a rectangular steel with a bottom area of 16 square cm. How long is the rectangular steel? We need to work out the formula
6. A square steel bar with an edge length of 0.8m is forged into a cuboid steel bar with a cross-sectional area of 20 square decimeters. How long is the steel bar I'm in a hurry
7. A cube billet with 20 cm edge length is forged into a cuboid steel with 16 square cm bottom area. How long is the cuboid steel?
8. There is a cuboid steel parts, the bottom area is 20 square decimeters, each cubic decimeter of steel weighs 7.8 grams, how much is this part?
9. The diameter of the bottom surface of a conical steel part is 4cm, which is 8 / 9 of the height. If the steel weight per cubic centimeter is 7.8G, how much is the weight of the part? (keep the integer result)
10. A conical steel part has a bottom radius of 10 cm and a height of 9 cm. If each cubic centimeter of steel weighs 7.8 g, how many kg does the part weigh? Keep the whole kilogram
11. Cast a cylindrical steel block with a bottom area of 35 square centimeters and a height of 8 centimeters into a conical part with a height of 15 centimeters. What is the bottom area of this part?
12. A cube iron block with an edge length of 6 decimeters is forged into a cuboid part with a bottom area of 15 square decimeters. What is the height of the part?
13. The volume of a cone is 25.12 cubic centimeters, the bottom area is 12.56 square centimeters, and its height is () A. 2 cm B. 5 cm C. 6 cm
14. A cylindrical iron block, with a bottom area of 12.56 square centimeters and a height of 5 centimeters, is cast into a cone part with a bottom area of 31.4 square centimeters What is the height of the part in centimeters
15. A cuboid steel is melted and cast into a machine part, which is composed of equal bottomed cylinder and cone. It is known that the ratio of cuboid bottom area to cylinder bottom area is 2:3, and cuboid height is 6cm. If the height of both cylinder and cone is the whole centimeter, then the minimum height of the part is
16. A cylindrical steel bottom diameter 8 cm long 90 cm, cast it into a bottom diameter 20 cm cylindrical machine parts, this machine parts height is how many cm? There are formulas, there are gains
17. The diameter of a cylindrical steel bottom is 8cm, and the length is 90cm. Make it into a cylindrical machine with the diameter of 20cm What's the height of the piece
18. The bottom diameter of a cylindrical steel is 8cm and the length is 90cm. How many cm is the height of a cylindrical machine part with a bottom diameter of 20cm Formula
19. The volume of 282.6cm cuboid iron block is melted and cast into a conical machine part with a bottom radius of 6cm
20. The volume is 282.6 cubic centimeter rectangular iron block is melted and cast into a cylindrical machine part with a bottom radius of 6cm. What is the height of the conical part?