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The length of a round steel is 1.2, now it is sawed into two small sections with each section of 0.6 meters long, and the surface area is increased by 12.56 square centimeters
When a cylindrical steel pipe is sawed into two sections, the increase in surface area is actually the two bottom areas. (1.2m = 120cm)
So the area of the bottom of the cylinder: 12.56 △ 2 = 6.28 square centimeter
Cylinder volume = bottom area × height = 6.28 × 120 = 753.6 cm3
A straight cylinder with a height of 5cm, its side view is rectangular, and the length of the rectangle is 12.56cm. What is the volume of the cylinder?
The bottom area of the cylinder: 3.14 × (12.56 △ 3.14 △ 2) 2, = 3.14 × 4, = 12.56 (square centimeter), the volume of the cylinder: 12.56 × 5 = 62.8 (cubic centimeter). Answer: the volume of the cylinder is 62.8 cubic centimeter
Xiao Ming uses a rectangular piece of paper 18.84 cm long and 12.56 cm wide to form a straight column. How many ways can he use? Which cylinder has the largest volume?
18.84 ／ 3.14 ／ 2 = 3 (CM); 3.14 × 32 × 12.56, = 3.14 × 113.04, = 354.9456 (cm3); 12.56 ／ 3.14 ／ 2 = 2 (CM); 3.14 × 22 × 18.84, = 3.14 × 75.36, = 236.6304 (cm3); a: there are two methods of girth; when 18.84 cm is the circumference of the bottom surface
RELATED INFORMATIONS
- 1. Roll a rectangular piece of paper 12.56 cm long and 9.42 cm wide into a cylinder. The volume of the cylinder is______ Cubic centimeter or______ Cubic centimeter
- 2. Xiao Hong takes a rectangular piece of paper, 20 cm in length and 3 / 5 in width, and uses it to form a cylinder. What is the volume of the cylinder?
- 3. After the side of a cylinder is expanded, a square with side length of 12.56 cm is obtained. What are the surface area and volume of the original cylinder? The perimeter of the bottom surface of a cone-shaped grain pile is 9.42 meters and the height is 2.7 meters. If it is installed in a cone-shaped beam with a bottom radius of 1 meter, how high can it be piled?
- 4. The surface area of a cylinder is 12.56 square centimeters more than its side area. The height of a cylinder is 5 centimeters. What is its volume? I'm sorry. I can do it. I've got a brain connection
- 5. What are the surface area and volume of a cylinder with a bottom radius of 1 decimeter and a square with its side expanded? As long as the first answer, give a reward, but I'm new here, by the way, tell me what 28.26x15 is equal to
- 6. The circumference of the bottom surface is 12.56 meters and the height is 6 meters
- 7. If the radius of the bottom of a cylinder increases by 5 cm, its side area will increase by 125.6 square cm. If the perimeter of the bottom increases by 4 cm, how many square cm will its side area increase?
- 8. The side view of a cylinder is square. The ratio of diameter to height of the bottom of the cylinder is () A. 2π：1B. 1：1C. 1：πD. π：1
- 9. Expand the side of a cylinder to get a square. It is known that the bottom area of the cylinder is 20 square centimeters. What is the surface area of the cylinder?
- 10. The surface area of a cylinder is 339.12 square centimeters, and the radius of its bottom is 3 centimeters @##￥%…… &%*…… （*&）（*（&*&%………… %￥%#￥@#!
- 11. A round steel, 1.2m sawed into 2 segments of 1.6m, the surface area increased by 12.56cm, calculate the original volume Come on,
- 12. A 1.2-meter-long round steel is sawed into two small sections of 0.6-meter-long. The surface area increases by 12.56 square centimeters. What is the original volume of this round steel?
- 13. If a 2-meter-long cylindrical steel is worn into four small columns, the surface area and volume of the cylinder will increase by 56.52 square centimeters compared with the original cylinder steel volume by 10 minutes
- 14. There is a 2-meter-long cylindrical steel. If it is cut into four small cylinders, the sum of the surface area of these four small cylinders will increase by 56.52 square centimeters. What is the volume of this cylindrical steel______ Cubic centimeter
- 15. The surface area of a 4-meter-long cylindrical timber increased by 12.56 square decimeters after sawing it into two small columns The volume is () cubic decimeter
- 16. The sum of the volumes of a cylinder and a cylinder with the same height and bottom is 24 square decimeters. What are the volumes of a cylinder and a cone?
- 17. If the height of a cylinder is reduced by 2 cm, the surface area will be reduced by 12.56 square cm. What is the bottom area of the cylinder?
- 18. Take a square paper with side length of 12.56 cm and roll it into a cylinder. The bottom radius of the paper cylinder is 2 cm. What is the bottom area
- 19. Take a piece of 18.84 cm long and 12.56 cm wide paper and circle it into a cylinder. The maximum area of the cylinder bottom is______ ．
- 20. Cut a cube with an edge length of 8 cm into the largest cylinder with a surface area of () square cm and a volume of () cubic cm