![](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>)
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?
55 △ 2 = 27.5 (CM) (27.5-3.5) △ 2 = 24 △ 2 = 12 (CM) 12 + 3.5 = 15.5 (CM) a: this rectangle is 15.5 cm long and 12 cm wide
The perimeter of the small rectangle is 3 / 5 of that of the large rectangle. If the length and width of the small rectangle are increased by 5cm, what is the perimeter of the two rectangles?
Perimeter of large rectangle: 5 × 4 ÷ (1-3 / 5) = 50 (CM)
Original perimeter of small rectangle: 50 × 3 / 5 = 30 (CM)
A: the circumference of the original small rectangle is 30cm
If you want to build a cuboid platform, which is 4.6 meters long, 80 cm wide and 35 cm high, how many bricks do you need? A brick is 24 cm long, 12 cm wide and 5 cm high
The volume of the table is 4.6m × 0.8m × 0.35m = 1.288m з
The volume of a brick is: 0.24M × 0.12M × 0.05m = 0.00144m з
So the volume of table / the volume of a brick = 1.288/0.00144 ≈ 894.4444
It's about 895 pieces, but it's needed without considering cement. It's just a reference
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 of the rectangle? What is the area?
Circumference △ 2 is a multiple of 12
Perimeter = 24 × 2 = 48 cm
Length = 24 ÷ (5 + 7) × 5 = 10 cm
Width = 24-10 = 14 cm
Area = 10 × 14 = 140 square centimeter
RELATED INFORMATIONS
- 1. 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?
- 2. 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~
- 3. 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!
- 4. 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
- 5. 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 ()
- 6. A cube has a base area and perimeter of 9 square decimeters. What is the surface area and volume of the cube
- 7. 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
- 8. A rectangular glass tank, the bottom is a square with a circumference of 56 cm, now pour 9 liters of water into the tank, what is the height of the water in the tank? (integer is reserved for the result)
- 9. A cuboid glass fish tank (with cover) is 50cm long, 40cm wide and 35cm high. How much is the water depth of 40 liters in this fish tank?
- 10. A cuboid glass tank, measured from the inside, has a square with a circumference of 6 decimeters at the bottom. Now, 9 liters of water is injected into the tank. How high is the water in the tank?
- 11. 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
- 12. 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
- 13. 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;
- 14. The height of a cone is 12cm, and it is semicircle when the side is unfolded? Urgent···· Before 8 o'clock
- 15. 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?
- 16. 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
- 17. 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?
- 18. The side length of a square is 6 cm. If you increase the side length by x cm, the area will increase______ Square centimeter
- 19. 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
- 20. 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