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When a cylinder with a bottom area of 24cm and a height of 12cm is sawed into two identical small cylinders, the surface area increases by () cm;
A cylinder with a base area of 24cm and a height of 12cm is sawed into two identical small cylinders, and the surface area is increased by (48) cm;
Roll a 30 cm long and 18 cm wide rectangular white paper into a cylinder. What is the side area of the cylinder?
Hurry! OK, add 20 points
White paper is its side!
30 × 18 = 540 (cm2)
As shown in the figure, a chopstick with a length of 24cm is placed in a cylindrical water cup with a diameter of 5cm at the bottom and a height of 12cm. If the length of the chopstick exposed on the outside is HCM, the value range of H is ()
A. 0＜h≤11B. 11≤h≤12C. h≥12D. 0＜h≤12
When the chopsticks are perpendicular to the bottom of the cup, h is the largest, h is the largest = 24-12 = 12cm. When the chopsticks and the bottom of the cup and the height of the cup form a right triangle, h is the smallest, as shown in the figure: at this time, ab = AC2 + BC2 = 122 + 52 = 13cm, ｜ H = 24-13 = 11cm
As shown in the figure, a chopstick with a length of 24cm is placed in a cylindrical water cup with a diameter of 5cm at the bottom and a height of 12cm. If the length of the chopstick exposed on the outside is HCM, the value range of H is ()
A. 0＜h≤11B. 11≤h≤12C. h≥12D. 0＜h≤12
When the chopsticks are perpendicular to the bottom of the cup, h is the largest, h is the largest = 24-12 = 12cm. When the chopsticks and the bottom of the cup and the height of the cup form a right triangle, h is the smallest, as shown in the figure: at this time, ab = AC2 + BC2 = 122 + 52 = 13cm, ｜ H = 24-13 = 11cm
RELATED INFORMATIONS
- 1. As shown in the figure, a chopstick with a length of 24cm is placed in a cylindrical water cup with a diameter of 5cm at the bottom and a height of 12cm. If the length of the chopstick exposed on the outside is HCM, the value range of H is () A. 0＜h≤11B. 11≤h≤12C. h≥12D. 0＜h≤12
- 2. A brick is 25cm in length, 12cm in width and 5cm in thickness. How much space can 1000 bricks occupy? +- x △ is represented by ←, and X △ can be copied. Be sure to write the ideas and notes of each part
- 3. The circumference of a rectangle is 55cm. It is known that its length is 3.5cm longer than its width. How many cm are the length and width of the rectangle?
- 4. The perimeter of a rectangle is between 40 cm and 50 cm. If the ratio of its length to width is 5:7, what is the perimeter and area of the rectangle?
- 5. The circumference of a rectangle is 96cm, and the length is 6cm less than twice the width. How many cm are the length and width? Let the length be xcm, and the width be YCM. According to the meaning of the problem, the equations are () Such as the title~
- 6. The bottom of a cuboid is a square. After expanding the side of the cuboid, a square with a circumference of 80cm is formed. What is the volume of the square? What does it look like when the side is unfolded Ask for an answer!
- 7. Put together a cuboid with five exactly the same cubes. The surface area is reduced by 24 square centimeters. The surface area of this cuboid is______ Square centimeter
- 8. Place 20 cubes whose edges are 1 cm long into a cuboid whose height is 2 cm. The surface area of the cuboid is () or ()
- 9. A cube has a base area and perimeter of 9 square decimeters. What is the surface area and volume of the cube
- 10. In a cylindrical glass jar with a bottom diameter of 12 cm, a height of 20 cm and a water depth of 15 cm, a cone iron block with a bottom diameter of 10 cm is put into the jar, and the water is cooled Rise 2cm, find the height of the cone iron block
- 11. The height of a cone is 12cm, and it is semicircle when the side is unfolded? Urgent···· Before 8 o'clock
- 12. A cuboid is 20cm in length, 12cm in width and 6cm in height. After it is divided into two cuboids, what is the minimum and maximum increase in surface area?
- 13. A 60cm, 20cm wide rectangular cardboard, cut a 5cm cube from four corners, and then fold it into a carton What's the surface area of this carton in square centimeter
- 14. How many small squares with an area of 4 square centimeters can a square paper with a side length of 16 cm be cut into?
- 15. The side length of a square is 6 cm. If you increase the side length by x cm, the area will increase______ Square centimeter
- 16. After four cubes of the same size are glued into a cuboid (as shown in the figure), the surface area is reduced by 54 square centimeters, and the surface area and volume of the cuboid are calculated
- 17. After four cubes of the same size are glued into a cuboid (as shown in the figure), the surface area is reduced by 54 square centimeters, and the surface area and volume of the cuboid are calculated
- 18. If a cuboid is reduced by 2 cm, it will become a cube. It is known that the surface area of a cube is 54 square cm. Find the volume of the cuboid I know that the square of 9 is 3, but the primary school students have not yet learned. The energy length of a scholar's Cube: 54 / 6 / 3 = 3cm, why divide by 3,
- 19. The surface area of a cube is 54 square centimeters, and the area of one side () square centimeters?
- 20. The surface area of a cuboid with a square cross section is 114 square centimeters. The largest cuboid is cut off and the surface area is 54 square centimeters, How much square centimeter has been subtracted from the surface area of the truncated cube wood?