After the side of a cylinder with a circumference of 6.28 decimeters on the bottom is expanded, a rectangle with a width of 2 decimeters is obtained. What is the side area and volume of the cylinder
Side area = 6.28 × 2 = 12.56 (square decimeter)
Bottom radius = 6.28 △ 3.14 △ 2 = 1 (decimeter)
Bottom area = 3.14 × 1 & # 178; = 3.14 (square decimeter)
Volume = 3.14 × 2 = 6.28 (cubic decimeter)
RELATED INFORMATIONS
- 1. The side area of a cylinder is 94.2 square meters, the height is 1.5 meters, the perimeter of its bottom surface is () meters, and the bottom area is () square meters
- 2. 1. The expanded view of the side area of a cylinder is a square. The height of the cylinder is 28.26 cm, so its ground diameter is () cm? 2. Roll a rectangular paper of 16 cm long and 10 cm wide into a cylinder. When the height is 10 cm, the maximum perimeter of the bottom surface is () cm; when the height is 16 cm, the maximum perimeter of the bottom surface is () cm
- 3. The circumference of the bottom surface of a cylinder is 18.84 meters, and the height is 1.2 meters
- 4. As shown in the figure: the circumference of the bottom surface of a cylinder is 16cm, and the height is 6cm. BC is the diameter of the upper bottom surface. An ant starts from point a and crawls along the side of the cylinder to point C, then the shortest distance for the ant to crawl is______ cm.
- 5. An ant starts from point a and crawls along the side of the cylinder to point C, Try to find the shortest way to crawl
- 6. As shown in the figure, the circumference of the bottom surface of a cylinder is 20cm, the height AB is 4cm, and BC is the diameter of the upper bottom surface. An ant starts from point a, crawls along the side of the cylinder to point C, and the shortest distance is Why is ad half the circumference after unfolding? Isn't ad the diameter of a circle?
- 7. A cylinder is 8cm high and 25.12cm in circumference. Now it is cut vertically along its diameter and its surface area is increased______ Square centimeter
- 8. How to calculate the surface area and volume of a half cylinder?
- 9. The volume formula of cone is______ The formula for calculating the volume of a cylinder is______ .
- 10. There are five same cylindrical columns in the hall. The perimeter of the bottom surface of each column is 3.14 meters and the height is 4 meters. To paint these columns, 0.5 kg per square meter, how many kg of paint do you need?
- 11. The side area of a cylinder is 226.08 square decimeters, and the perimeter of its bottom is 37.68 decimeters
- 12. A cylinder is 12.56 cm high, and its side is expanded to be a square. What is the volume of the cylinder in cubic centimeter
- 13. The side area of a cylinder is 12.56 square centimeter, the radius of its bottom is 2 centimeter, and the height of it is______ Cm
- 14. The height of a cylinder is equal to the circumference of its bottom. If the height is shortened by 2 cm, the surface area will be reduced by 12 square cm. What is the side area of the cylinder Square centimeter
- 15. A rectangular sheet of iron is 20 cm long and 6.28 cm wide. Taking it as the side of a cylinder, what is the maximum volume of the cylinder?
- 16. The side area of a cylinder is 942 square centimeter and its volume is 2355 cubic centimeter
- 17. A cylinder has a side area of 942 square centimeters and a volume of 2355 cubic centimeters. How many centimeters is its bottom radius?
- 18. The diameter of the bottom surface of a cylinder and a cone is equal, and the height of the cone is 2 / 3 of that of the cylinder. If the volume of the cylinder is 54 cubic centimeters, calculate the volume of the cone
- 19. For a cylinder and a cone, the ratio of the circumference of the bottom surface is 2:3, the ratio of their volume is 5:6, and the simplest integer ratio of the height of the cone and the cylinder is () A. 54:23B. 54:2C. 15:8D. 8:5
- 20. The bottom area and volume of a cylinder and a cone are equal. If the cone is 18 meters high, how many meters is the cylinder high Completion