What is the surface area formula for a cylinder? How many

Bottom area = 3.14 × r? Side area = bottom perimeter × high surface area = side area + bottom area × 2

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1. Who knows the formula for calculating the volume of a cylinder?
2. The volume formula of the cylinder,
3. On the surface area formula of cylinder To make a cylindrical oil barrel with iron sheet [no cover], the radius of the bottom area is 6 decimeters and the height is 18 decimeters. How many square decimeters of iron sheet is required to make 10 such oil barrels at least [joint is not included]
4. Write a few chemical expressions In this paper, the expressions of oxygen production from hydrogen peroxide solution or potassium permanganate and combustion reaction of charcoal in oxygen are written, and the three reactions are compared in terms of reactants and products
5. The literal expression of Chemistry
6. Please write out the chemical expressions of these twenty literal expressions 1. Copper sulfate_____________ 2. Calcium sulfate_____________ 3. Zinc sulfate_____________ 4. Magnesium sulfate_____________ 5. Sodium sulfate_____________ 6. Potassium sulfate_____________ 7. Sodium carbonate_____________ 8. Calcium carbonate_____________ 9. Barium carbonate_____________ 10. Silver nitrate______________ 11. Barium nitrate______________ 12. Copper nitrate______________ 13. Sodium nitrate______________ 14. Barium sulfate______________ 15. Copper hydroxide_______________ 16. Calcium hydroxide_______________ 17. Barium hydroxide_______________ 18. Aluminum hydroxide_______________ 19. Magnesium hydroxide_______________ 20. Sodium hydroxide_______________
7. Write chemical expressions based on words CuO is added with excess dilute sulfuric acid to form solution a The mixture of CuO and Fe is heated with enough CO to form solid B Solution a and solid B form gas C, solution D and solid pure E Find a B C D
8. Writing literal expressions is required It's a combination reaction and an oxidation reaction () It's an oxidation reaction, but not a combination reaction ()
9. On the expression of chemical characters in grade three of junior high school [a generates substance C and D through b] is written as a + B - > C + D [b transforms a into substance C, D] is written as a - > (B is written above the arrow) C + D Is it?
10. Reaction expression of aluminum combustion in oxygen Such as the title
11. How to find the surface area of a cylinder,
12. What is the formula for calculating the surface area and volume of a cylinder?
13. Calculation formula of cylinder surface area + Example
14. In the process of deriving the cylinder formula, the surface area of the rectangle is 20 cm larger than that of the cylinder. What is the side area of the cylinder?
15. Volume formula and surface area formula of cylinder and cone!
16. What is the suggested English expression?
17. The surface area formula of primary cylinder (including derivation formula) is expressed in words
18. For a cylinder, its height increases by 3 decimeters, and its side area increases by 18.84 square centimeters. What is the bottom area of the cylinder
19. For a cylinder, if its height increases by 3 cm, the side area will increase by 18.84 square cm. What is the bottom area of the aid?
20. If the height of a cylinder is increased by 3 cm, the side area will be increased by 18.84 square cm. What is the bottom area of the cylinder______ ．