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?

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• 1. 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
• 2. 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]
• 3. 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
• 4. 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
• 5. 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?
• 6. 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
• 7. 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
• 8. 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?
• 9. 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?
• 10. 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)
• 11. 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?
• 12. 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
• 13. 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
• 14. 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
• 15. 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
• 16. 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
• 17. 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
• 18. The volume of 282.6cm cuboid iron block is melted and cast into a conical machine part with a bottom radius of 6cm
• 19. 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?
• 20. The length of a machine part is 0.8 cm. On a 40:1 scale drawing, how long is it?