Find a carton with a lid. Open the lid and observe every two sides and joints. Is the surface area of the carton equal to the total area of the paper? Why?

Not equal, because the joint will overlap no matter how, and the overlapping part is the part with larger paper area than surface area

RELATED INFORMATIONS

1. The volume of an open cube carton is 5 cubic centimeters less than half of that of a cube whose edge length is 4cm. What is the surface area of the carton
2. How many square meters of cardboard should be used to make a cube carton with an edge length of 6 decimeters?
3. The utility model relates to a square cardboard box without a cover, with an edge length of 9 decimeters. How many square meters of cardboard are needed at least to make 50 such cardboard boxes
4. Xiao Ming wants to make a cube carton (with cover) with an edge length of 0.9 meters. At least how much cardboard should he use? What's the volume of the carton?
5. How to cut the rectangular cardboard (as shown in the figure) with 10 cm long and 6 cm wide to make a square cardboard box with 2 cm edge length? Use shadow to show the parts that should not be cut. At least two different schemes are given
6. What is the volume of a cube cardboard box with an edge length of 8cm? How many square centimeters of cardboard should be used to make 2000 cartons?
7. It is known that the edge length of the first cube carton is 6cm, and the volume of the second cube carton is 127cm3 larger than that of the first carton. The edge length of the second carton is calculated
8. The sum of the side length of a square and the width of a rectangle is 20 cm, the perimeter of a square is one third of the perimeter of a rectangle, the width of a rectangle is 4 / 5 of the length, and the sum of the area of a rectangle and a square is how many square centimeters?
9. Use three 15 cm square to make a rectangle and find the perimeter of the rectangle
10. Cut a piece of rectangular paper 120 cm long and 80 cm wide into a square of the same size and as large as possible. There is no paper left. At least how many pieces can be cut? Please list
11. Take a rectangular paperboard 8 cm in length and 6 cm in width, and cut off four small cubes 1 cm in side length from four corners to make a cuboid carton without cover Find the volume of this cuboid
12. At the four corners of a square newspaper with a CM side length, subtract one side length from each other, which is BCM (b)
13. A small square with X (CM) side length is subtracted from the four corners of a rectangular sheet of iron with the ratio of length to width of 2:1, and folded to make an open iron box If the sheet width is a (CM) (a > 2x), the volume of the iron box can be calculated
14. As shown in the figure, a small square with a side length of 2 √ 2cm is cut off at the four corners of the square cardboard with a side length of (20 √ 3-6 √ 2) cm, and then folded along the dotted line to form a carton without cover, and the volume of the carton is calculated
15. As shown in the figure, the four corners of a square sheet iron are cut off, and a small square with side length of 4 cm is made into a box without cover. If the volume of the box is 400 cm3, the side length of the original square sheet iron is calculated
16. A rectangular iron sheet (as shown in the figure), 25 cm long and 15 cm wide, cut out the small square with side length of 2 cm from the four corners, and then fold it around to make an iron box without a cover. Please help to calculate: how much iron sheet does it need to make such a box? What is the volume of the iron box?
17. The square iron sheet with side length of 48 cm is used to make an iron box without cover
18. There is a rectangular sheet of iron, 24 cm long and 14 cm wide. Cut out the same small square at the four corners, and fold it to make a uncovered iron box, so as to find the capacity of the iron box The side length of the cube is 4cm
19. In the four corners of a square with side length of ACM, subtract one square with side length of 5cm, (2 / a > 5) In the four corners of a square with side length of ACM, subtract a square with side length of 5cm, (2 / a > 5) to make a 900 cubic centimeter uncovered box. How much is the side length a of the square?
20. As shown in the figure, when a square with side length x is cut off from the four corners of the rectangular paper piece with length 6 and width 4 respectively, and the area of the cut off part is equal to the area of the remaining part, the side length of the square is______ ．