Use a 7-meter-long rope to circle the hall pillar for 2 times, with 0.72 meters left. What is the floor area of this pillar?

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• 1. After a 10 meter long rope goes around a tree trunk for three times, the remaining 0.58 meters. What is the cross-sectional area of the tree trunk?
• 2. Use a 7-meter-long rope to circle the hall pillar for 2 times, with 0.72 meters left. What is the floor area of this pillar?
• 3. If a rope is wound around the post for two turns, the rope will be 40 cm more. If it is wound around the post for three turns, the rope will be 20 cm less. How long is the rope?
• 4. If you use a rope to wrap around the column for 2 turns, the rope will be 40 cm more. If you wrap around the column for 3 turns, the rope will be 20 cm less. How long is the rope? How to list the formula
• 5. A concrete square column is 3.5 meters long and its cross section is a square with side length of 3 decimeters. Each cubic decimeter of concrete weighs 2.2 kg. How many kg are eight such square columns
• 6. A square steel is 3 meters long, and its cross section is a square with a side length of 4 cm. It is known that each cubic decimeter square steel weighs 7.8 kg. How many kg does this square steel weigh?
• 7. There are four square pillars in the school hall, each of which is 5 meters long. The ground is a square with a side length of 6 decimeters. Paint should be painted around the four sides of each square pillar, and paint should be used for each square meter 1.5kg, how many kg of paint is needed? 2. A rectangular biscuit box with a square bottom is cut along the height of its side trademark to get a square with a side length of 60cm. What is the volume of the biscuit box?
• 8. A cuboid square steel, 3 meters long, cross-section is 5 cm square, if each cubic decimeter of steel 7.8 kg
• 9. On a four meter long cylindrical steel column, a 31.4-decimeter-long iron wire is used to circle the steel column for 10 times. What is the volume of the steel column? The best time is 15 minutes
• 10. A 24 decimeter long wire is used to form the largest cube frame. The volume of the cube is () cubic decimeters
• 11. The construction site uses concrete to cast a cuboid column. The column is 3 meters high and the bottom is a square with a side length of 0.6 meters. How many cubic meters of concrete is required to cast this column at least? If you stick ceramic tiles around the column, how many square meters is the area of tile?
• 12. The construction site uses concrete to burn and cast a cuboid column. The column is 3 meters high, and the bottom surface is a square with side length of 0.6 meters. How many cubic meters of concrete does it need to burn and cast this column at least? If a square ceramic tile with side length of 3 decimeters is pasted around the column, paste it How many square meters is the area of ceramic tile
• 13. The construction site is poured with concrete into a cuboid column. The length of the column is three meters, and the bottom surface is a square with a side length of 0.6 meters How many cubic meters of concrete is required to cast this column
• 14. In the square in front of Xinmin building, a rectangular column is poured with concrete, which is 2 meters long and 0.6 meters long at the bottom. What is the area of the column?
• 15. There are eight cuboid pillars in the auditorium. The floor of the pillars is a square with a side length of 0.3 meters. The height of the pillars is 5 meters. How many square meters is the area decorated with ceramic tiles now
• 16. A cuboid column, 4.5 meters high, with a side length of 0.6 meters square at the bottom. To paste tiles around the column, the tile specification is a side length of 0.6 meters square, how many tiles do you need?
• 17. There is a concrete square column in the city gymnasium, which is 4 meters long and the bottom is a square with a side length of 3 decimeters. If the square column is pasted with ceramic tiles, what is the area of the tile part? How many cubic meters of concrete does this square column need?
• 18. The perimeter of the bottom surface of a cylindrical cement column is 1.884, and the height is 3.5. How many cubic meters of concrete are needed to cast five cement columns?
• 19. A rectangular column is poured in a construction site. It uses 30 meters of concrete. The column is 20 meters high and the bottom is a square. Please estimate the side length of the square on the bottom? (accurate to 0.1 meters)
• 20. Xiao Li wants to put a small gift that is 18cm long, 15cm wide and 12cm high into a packaging box that is 20cm long, 16cm wide and 3.2 cubic decimeters in volume, Can you fit it?