To make a funnel with a diameter of 60 and a depth of 40 to draw oil, what kind of sector iron sheet is needed to support its center angle and radius

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• 1. Cut a sector with a center angle of 120 ° from a circular plate with a radius of 12cm, and use it to make a funnel to find the height of the funnel?
• 2. Cut a sector with a central angle of a from a circular sheet of iron with radius r to make a funnel. When a is what, the volume of the funnel is the largest? High number, the function of the maximum and minimum application Answer a = 2pi radical (2 / 3)
• 3. The sector with a radius of 10 cm and a central angle of 216 ° is rolled into a conical funnel. The height of the funnel is known to be 8 cm, and the volume of the funnel is calculated
• 4. A conical container is made by cutting a sector with the center angle of alpha from a round sheet iron with radius R. the volume of the container is the largest when the center angle of the sector is larger
• 5. How to draw the unfolded sector diagram of conical funnel (AutoCAD) How to draw a sector diagram for a conical funnel with a diameter of 430cm at the upper opening and 400cm at the lower opening and a slope height of 150cm. It is also possible to give an accurate calculation formula
• 6. Ask welding cone funnel data, how to draw fan! The diameter of the lower hole is 50 cm, the diameter of the upper hole is 140 cm, and the height is 40 cm
• 7. A gift box is a cube. The sum of the edges of the box is 132 cm. What is the surface area of the box
• 8. A gift box is a closed square carton with a surface area of 150 square centimeters. Now we need to make a cube outer box to make its volume smaller How much is the length of the edge, which is twice the volume of the original square?
• 9. A cube gift box, edge length 6cm, how many square centimeters of wrapping paper should be used to wrap the gift box at least?
• 10. 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?
• 11. I want to make a cone funnel with 80 cm in diameter at the top and 30 cm in diameter at the bottom, and 40 cm in height. Please help me and draw a sector diagram,
• 12. As shown in the figure is a funnel-shaped iron pipe joint, its bus length is 35cm, the two bottom diameters are 50cm and 20cm, and 10000 such joints are made
• 13. Is the formula of cone area the same as that of sector area?
• 14. How to get the formula of the area of the cone side? RT Is S-cone side = L * a * 1 / 2 = 2 π R * a * 1 / 2 = π RA?
• 15. Find the formula of cone area I read on the Internet that the side area is a sector, but isn't the sector formula n △ 360 × π R & # 178? Why is it π RL What's the difference? L is the bus, which is the same as R in n △ 360 × π R & # 178; and how does π RL come from?
• 16. What's the area of the funnel
• 17. A glassware manufacturing company wants to manufacture a conical funnel with a volume of 1 liter (1 liter = 1 cubic decimeter). (1) the area s of the funnel mouth and the depth d of the funnel What is the functional relationship? (2) if the area of the funnel mouth is 100 square miles, what is the depth of the funnel? (solving process, urgency,)
• 18. To make a conical funnel, its generatrix length is 20 cm, and its height should be () cm A. 2033B. 100C. 20D. 203
• 19. As shown in the figure, a glassware manufacturing company wants to manufacture a conical funnel with a volume of one liter (1 liter = 1 cubic decimeter) 1. What is the functional relationship between the area s of funnel mouth and the depth d of funnel 2. If the area of the funnel mouth is 100 square centimeters, what is the depth of the funnel
• 20. I use a funnel to blow the table tennis. Why is the table tennis sucked in the funnel?