![](data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 72 71" width="72"></svg>)
Cut a cube with an edge length of 6 decimeters into the largest cylinder. What is the volume and surface area of the cylinder? A section of square steel is 5 meters long and its cross section is a square with side length of 4 cm. How many kg does this section of square steel weigh? (7.8 kg per cubic decimeter of steel) a section of square steel is 5 meters long and its cross section is a square with side length of 4 cm. How many kg does this section of square steel weigh? (7.8 kg per cubic decimeter of steel)
1. Cut a cube with the edge length of 6 decimeters into the largest cylinder. What's the volume and surface area of the cylinder? Volume: 6 / 2 = 3 3 * 3 * 3.14 * 6 = 169.56 surface area: 6 / 2 = 3 * 3 * 3.14 = 28.26 28.26 * 2 = 56.52 6 * 3.14 * 6 = 113.04 56.52 + 113.04 = 169.562. A section of square steel with the length of 5
The height of a half cylinder is 12cm, the diameter is 8cm, and the surface area must be a half cylinder,
Analysis: the surface area of a half cylinder includes two semicircles at both ends (a circle can be formed), a rectangle 12 cm long and 8 cm wide, and a curved surface (half of the side of the cylinder). The radius is 8 / 2 = 4 cm
Surface area = 4 & # 178; * 3.14 + 12 * 8 + 3.14 * 8 * 12 / 2 = 296.96 square centimeter
What is the surface area of a figure obtained by splitting a cylinder with a bottom diameter of 8cm and a height of 16cm from the middle
The figure obtained by splitting from the middle is a rectangle
Area of rectangle = bottom diameter × height = 8 * 16 = 128 square centimeter
The diameter of the bottom surface is 8cm and the radius is 4cm
Split in the middle, you get a half cylinder
Surface area of half a cylinder
=Bottom area + half side area + rectangle area
=3.14*4*4+3.14*8/2*8+8*16
=379.2 square centimeters
What is the surface area of a figure with a bottom diameter of 8cm and a height of 16cm obtained by splitting a cylinder from the middle?
If you will, please answer as soon as possible. If you won't, please take a look!
Original surface area = 3.14x (8 △ 2) &# 178; x2 + 3.14x8x16 = 502.4 square centimeter
Increased area = diameter x height = 8x16 = 128 square centimeters
Current surface area = 502.4 + 128x2 = 758.4 square centimeter
RELATED INFORMATIONS
- 1. The diameter of the bottom surface of a cylinder is 14 cm, the surface area is 1406.72 square cm, and the height of the cylinder is______ Cm
- 2. A cylinder with a diameter of 5cm at the bottom and a height of 12cm is cut into two and a half cylinders along the diameter, and the surface area increases () Come on, as long as it turns out
- 3. A cylindrical wood with a diameter of 12cm and a height of 10cm on the bottom surface is sawed half along the diameter of the bottom surface to calculate the original surface area of the cylinder
- 4. As shown in the figure, after a cylinder is cut off 5cm, the surface area of the cylinder is reduced by 31.4cm2
- 5. The height of a cylinder is 20 cm. If the height is reduced by 5 cm, the surface area is reduced by 100 square cm. What is the volume of the original cylinder
- 6. A mathematical problem: after a 16 cm long cylinder is cut off by 6 cm, the surface area of the cylinder is reduced by 37.68 square cm. What is the original surface area of the cylinder?
- 7. Calculate the surface area of the half cylinder in centimetres High: 40 Diameter: 10
- 8. As shown in the figure below, a is the midpoint on the de side of the triangle CDE, BC is equal to two-thirds of CD, if the area of the triangle ABC (shadow part) is 10 square centimeters, find three Area of angular abd and triangular ace?
- 9. In the triangle ABC, D is the midpoint of BC, AC = 3ec, the area of CDE is 6 square centimeters, what is the area of ABC
- 10. As shown in the figure, in the triangle ABC, ad is the height on the bottom BC, the area of triangle ABC = 6 square centimeters, ad = 2 centimeters, and the distance from point C to ad is 2 Cm, find the distance from point B to AD
- 11. How large is the surface area of the largest cylinder cut from a cube with an edge length of 10 cm?
- 12. A cylinder, 20 cm long, 5 cm long is cut off, the surface area of the cylinder is reduced by 31.4 square centimeters, the volume of the original cylinder
- 13. Cut a cuboid 12 cm long, 9 cm wide and 5 cm high into two cuboids. What is the maximum sum of the surface area of the two cuboids? What's the minimum square centimeter?
- 14. The diameter of the small cylinder is 6cm, the height is 12cm, the diameter of the large cylinder is 12cm, and its volume is twice the volume of the small cylinder?
- 15. Surface area: 1. Bottom radius 3cm, height 5cm. 2. Bottom perimeter 15.7cm, height 4cm. 3. Bottom diameter 4cm, height 4cm 4. Lateral area 62.8dm, height 5DM
- 16. The diameter of the bottom surface of a cylinder is 4 meters and the height is 6 meters. If the cylinder is cut in half along the diameter of the bottom surface, how much will the surface area of the cylinder increase?
- 17. If the height of a cylinder of 10 cm is increased by 2 cm, its surface area will be increased by 125.6 square cm
- 18. When the height of the cylinder is 10 cm and the bottom radius is 6 cm, the side area of the cylinder is 0___ The surface area of the cylinder is__ cm²
- 19. If the side area of a cylinder is 50.24 square centimeter and the height is equal to the bottom radius, what is the surface area?
- 20. The circumference of the bottom of the cylinder is 25.12cm, and it is cut in half along the diameter of the bottom. The surface area of the cylinder is increased by 112 square cm