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?

Yes, the expanded side view of a cone is a sector, which is obtained by substituting the area formula of the sector 1 / 2 arc length (that is, the circumference of the circle at the bottom of the cone 2 π R) by the radius (the generatrix of the cone a)

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1. Is the formula of cone area the same as that of sector area?
2. 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
3. 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,
4. 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
5. 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?
6. 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)
7. 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
8. 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
9. 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
10. 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
11. 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?
12. What's the area of the funnel
13. 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,)
14. To make a conical funnel, its generatrix length is 20 cm, and its height should be () cm A. 2033B. 100C. 20D. 203
15. 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
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18. As shown in the figure, the surface area of a cuboid with a length of 15 cm, a width of 10 cm and a height of 5 cm is increased by () square cm after it is divided into three small cuboids A. 50B. 100C. 200D. 750
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20. The cuboid beverage box is 15cm in length, 10cm in width and 5cm in height How many square centimetres of label paper do you need if you stick a circle of label paper around the beverage (no label on the top and bottom)?