There are two cuboid pillars in the children's palace, 4 meters high, with a square bottom and a circumference of 1.2 meters, What is the total area of the two pillars painted? It's a formula!

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• 1. The diameter of the bottom of the pillars in the hall is 6 decimeters, and the height is 5 meters. Paint the eight pillars. Use 0.5 kg per square meter. How much paint do you need?
• 2. The lobby of a hotel has 6 large cylindrical columns, 10 meters high and 25.12 decimeters in circumference. All the columns should be painted. If the painting fee per square meter is 80 yuan, how much will it cost?
• 3. The side of a cylinder is a square. The perimeter of the square is 6.28 decimeters. What is the volume of the cylinder? Help me
• 4. There is a cylindrical pile, cut along the diameter, the section is a square, the circumference of the bottom of the cylinder is 12.56 decimeters, circle
• 5. A cylinder with a height of 6.28 decimeters, its side area expansion is just a square, how many square decimeters is its surface area? Make it clear,
• 6. There are two ways to encircle a cylinder with a rectangular sheet of iron 31.4 decimeters long and 12.56 decimeters wide. One is () decimeters in diameter and () decimeters in height. The other is () decimeters in diameter and () decimeters in height
• 7. The volume of a cone is 6 cubic decimeters less than that of a cylinder. What is the volume of a cone and that of a cylinder
• 8. The volume difference between a cylinder with equal base and height and a cone is 9.42 cubic centimeter. What is the volume of cone? What is the volume of cylinder?
• 9. What is the volume ratio of a cylinder with equal base and height to a cone? How many percent more is the volume of a cylinder than that of a cone? What is the volume ratio of a cone to that of a cylinder What's the volume?
• 10. The volume of a cylinder with equal base and height is larger than that of a cone______ %The volume of a cone is less than that of a cylinder
• 11. There are 10 columns in the corridor. The radius of the bottom of each column is 4 decimeters and the height is 2.5 meters There are 10 cylindrical columns in the school corridor. The bottom radius of each column is 4 decimeters, and the height is 2.5 meters. To paint these columns for the celebration of June 1 performance, 0.3 kg of paint is used per square meter. How many kg of paint are needed?
• 12. There are four cylindrical columns in the corridor outside the classroom. The diameter of the bottom of each column is 6 decimeters. Paint these columns with 0.3 paint per square meter Kg, how many kg of paint are needed? (the number obtained shall be kept to two decimal places)
• 13. There are four cuboid columns in the school auditorium, with a square bottom, a side length of 0.6 meters and a height of 5 meters. Paint the four sides of the column Please mark whether you are sure after answering,
• 14. There are four cuboid pillars in the auditorium. The bottom is a square with a side length of 5 decimeters and a height of 5 meters. What is the area of painting these pillars/
• 15. There are four cuboid shaped pillars in the auditorium. The bottom is square, with a side length of 6 decimeters and a height of 5 meters. If you want to paint the four pillars, how many square meters is the paint area?
• 16. There are 10 cylindrical columns in the school corridor. The diameter of the bottom of each column is 4 decimeters and the height is 2.5 meters. To paint these columns, 0.3 kg of paint is used per square meter. How many kg of paint is needed? There is a process
• 17. There are 8 cylindrical columns in the school. The bottom diameter of each column is 4 decimeters and the height is 30 decimeters. Now we need to paint these columns. If 0.25 kg of paint is needed per square meter, how many kg of paint is needed? Final result: 7.536 find the detailed formula
• 18. There are six columns in the hall. The bottom radius of each column is 4 decimeters and the height is 5 meters. If the painting fee is 0.5 yuan per square meter, how much is the total painting fee for the six columns?
• 19. Paint a column in a building. To calculate the area to be painted is to calculate the bottom area of the column
• 20. Build a cylindrical biogas digester. The perimeter of the bottom surface is 18.84 meters and the depth is 2 meters. Cement the four walls and the bottom surface of the digester. How many square meters is the area of the cement part?