Why don t you make mahjong into a square cuboid so that you don t have to think about the direction

Some things don't need a reason, it's a classic in itself.

Mahjong has a historical thing, its predecessor is the Ming Dynasty Sanbao eunuch Zheng He in the process of going to the West, in order to relieve the boredom of the soldiers, encourage the military spirit and invent a kind of bamboo card. It's been more than 600 years. Mahjong is an independent entity in its own right.

Some people even use mahjong to describe the shape of other things.

In fact, the chess is replaced by a square, and the Go is replaced by red and green, which does not have much impact on the sound of the game, and even as the landlord said, I found that the chess is replaced by a square, but it is also easy to place, and it is not easy to roll off, lost... But the classics are not to be easily modified. It's like no one has the ability to put on a perfect arm for Venus.

The scriptures have been passed down and preserved in the process of being convinced and even believed in for many years. We don't even have a reason to question anything.

But have you thought about it? Our Chinese characters are square words, mahjong in a suit is "10,000", just imagine, if the vertical writing of "50,000", "90,000" appears in a square card, can the card not be ugly?

For hundreds of years, the design of mahjong cards with a cuboid shape was a natural choice, because mahjong has always been a game of entertainment for the people, not an official competitive sport. It is because people feel that the design of mahjong tiles is the most reasonable in the long-term game, and they all make it into a cuboid.

If each mahjong is a cuboid, 25 pieces spelled out are a cuboid. If each mahjong is a cube, 25 pieces are spelled out to be a cube.

Correct Box: A three-dimensional figure surrounded by six rectangles (in the special case two opposite faces are squares) is called a cuboid. Cube:

A cuboid with equal length, width, and height is called a cube. The cube is a special cuboid: Features of the box:

A box has 6 faces, each of which is rectangular (there may be two faces that are square), and the two opposite faces are exactly the same. The box has 12 edges, each of which is equal to 4 edges (it can be divided into 3 groups according to the length of the edges). The point where three edges intersect is called a vertex.

The box has 8 vertices that intersect the same vertex with unequal edges, which are called the length, width, and height of the box. It can be divided into 4 groups with the length, width, and height on the same vertex. Characteristics of the cube:

The cube has 6 faces, all of which are equal in size;The cube has 12 edges, all of equal length, with 8 vertices. A cube is a special type of cuboid. Both the box and the cube have 6 faces, 12 edges, and 8 vertices.

The length, width, and height of the box can be unequal.

If the length, width, and height are equal, it is a cube, so it is said that the cube is a special cuboid.

A cube can be seen as a cuboid with equal length, width, and height.

Wrong, because the cube is a special cuboid.

That's right, because the cube evolved from the rectangular Hugh.

Not all have to be in the state of life.

Yes, the same as a square rectangle.

The length, width and height of the cuboid are not equal, and if they are all equal, it can be said to be a cube, so the cube is a special cuboid. It is of the same nature as a square rectangle.

Cubes: Rubik's cubes, dice, ink tanks, building blocks, gift boxes, etc.

Cuboids: bricks, shoeboxes, toothpaste boxes, textbooks, speakers, refrigerators, vertical air conditioners, etc.

Some of the items are described below:

1. Rubik's Cube. Rubik's Cube, English name rubik'The S cube, also known as the Rubik Cube, was first invented in 1974 by Professor Erno Rubick of the Budapest School of Architecture in Hungary. The Rubik's Cube is an extreme hand sport. In Taiwan, it is called the magic square, and in Hong Kong, it is called twisted dice.

2. Dice. Dice (tóu zi), a game used for throwing in traditional Chinese folk entertainment. It was there as early as the Warring States period. Commonly used as a prop for table games, the most common dice are six-sided dice, which are cubes with one to six holes (or numbers) on them, and the sum of the numbers on the opposite sides must be sevens.

3. Ink tank.

Ink tank, the box used to hold the ink bottle, is a paper material that is more common in general life, and the common ones are cube shapes and cuboid shapes.

4. Building blocks. The building blocks are usually cubic wood or plastic solid toys, generally decorated with letters or pictures on each surface, allowing for different arrangements or building activities, building blocks have various styles, can develop children's intelligence, can be built into houses, various animals, etc.

5. Bricks. A kind of rectangular stone used to build walls, made of clay firing, mostly red, commonly known as "red bricks", and also cyan "green bricks". The size of the Chinese standard clay brick is 240 115 53mm, and the purpose of this size is to ensure that the ratio of length, width and height of the brick is 4:2

1 (including 10mm slit width).

6. Shoebox. Clothing, shoes and hats, clothing, sports, casual shoe boxes: it is the outer packaging item of shoes, and it is also a kind of advertising plane for shoe enterprises, and it is also an indispensable packaging item for personal collection, sorting and placement of shoes.

Cubes: Rubik's Cube, dice.

Cuboids: bricks, doors, chalk boxes, shoeboxes, etc.

Cube : Dictionary Chalk Box Cosmetic Packaging Rubik's Cube.

Cuboid: toothpaste box, textbook, speaker, refrigerator, vertical air conditioner.

Cube: dice. Cuboid: Most shoeboxes, milk cartons. That's a lot.

It adds four faces that are the four sides of the cube, and the area of one face of the cube is:

4 4 = 1 square meter.

The surface area of the original cube is:

1x6 = 6 square meters.

The surface area of the original cube = 4 4 6 = 1 6 = 6

It adds 4 faces of a cube that do not coincide with the faces of the box.

Here's how to make a cube:

Step 1: Since there are six sides of a square, and each side is the same square, I set the side length of a square to be 5 cm (this side length is set according to my preference), and the shaded part on the periphery is the pasted part.

Step 2: Cut it out.

Step 3: Fold in half according to the lines drawn.

Step 4: Paste the shadow part to make a cube with a side length of five centimeters

In addition to the above drawing methods, there are 10 other ways to draw the cube, as shown in the figure below

A cuboid is a straight quadrangular prism with a rectangular base. A box is made up of six faces, the opposite faces are equal in area, and two faces (four faces may be rectangular, or all six faces are rectangular) are squares.

A three-dimensional figure surrounded by six identical squares is called a cube. A straight parallelepiped with a square side and bottom surface is called a cube, that is, a hexahedron with equal edge lengths, also known as a "cube" or "regular hexahedron". Since all 6 faces are equal, the surface area of the cube = base area 6 = edge length edge length 6.

1. Cuboid:

1) Prepare a rectangular piece of paper, folded like this.

2) Fold the long side of the rectangular paper into 8 equal parts, open, and then fold out 8 small square folds on the upper and lower edges respectively and open.

3) Align the edge of the 3rd grid on the top right, and fold the diagonal of the 4th small square, that is, the first diagonal line, and the bottom edge is folded in the same way. Align the 6th grid edge line left and right, fold out the 2nd oblique line, the 3rd oblique line, and the lower edge is folded in the same way, the first oblique line up and down is folded inward, 4) when contracting, take the 3rd side grid line as the axis, fold it to the right to the inside, 5) erect the first grid inside, 6) shrink and fold the second diagonal line inward, 7) cover the right side and cover it to the left, that is, complete the rectangular three-dimensional box of the 6 hedra.

2. Cube:

1) Prepare the required materials and tools.

3) Use a ballpoint pen to count the third square from the left and draw a square of the same size underneath.

4) Use a ballpoint pen to continue on top of the square and draw a square of the same size as well.

5) Cut out along the ballpoint pen with scissors and glue each square edge together with tape, and the cube is complete.

You can draw a pattern with a ruler first, and then fold it according to the pattern.

Make a diagram of a rectangle with a length of 7 cm, a width of 5 cm, and a height of 3 cm out of cardboard.

The last page of the math book has itself. I am. You're alone together.

You are a person who has your own person, who is it? What's wrong with the people around you who are going to be in my heart at this time? It's probably not that easy!

Such a large amount of preservatives! Such a large amount of preservatives! So much defense.

Use cardboard to make a cube with edges of five centimeters, and make a cuboid with a length, width, and height of seven centimeters, five centimeters, and three centimeters.

1. Cuboid formula:

1. Formula for the surface area of the cuboid = (length * width + length * height + width * height) * 2

s=(a*b+a*h+b*h) *2

2. Calculate the area of the cuboid without superstructure or paint the house = (length * height + width * height) * 2 + length * width.

s=( a*h+b*h)*2+a*b

3. Calculate the area of the cuboid ventilation pipe or drainage pipe = length * width + length * height) * 2

s=(a*b+a*h)*2

4. Calculate the area of the logo or tile around the rectangle = (length * height + width * height) * 2

s=( a*h+b*h)*2

5. Box volume = length * width * height.

v= a*b*h

6. Cuboid volume = base area * height.

v= s*h

7. Base area = length * width.

s= a*b

2. Cube formula:

1. The formula for the surface area of the cube = edge length * edge length * 6

s= a*a*6

2. The area without the upper cover of the cube = edge length * edge length * 5

s= a*a*5

3. The square is considerate of the surrounding trademark = edge length * edge length * 4

4. Cube volume = edge length * edge length * edge length.

v= a*a*a

5. The volume of the cube = the base area * the height.

v= s*h

When calculating, you must see the name of the unit clearly, the unit is not unified, and it must be converted and unified before calculation.

A cuboid is a straight prism with a rectangular base. A cube is a special cuboid, and a cube is a cuboid with six sides square.

Each rectangle of the box is called the face of the box, the line where the face intersects is called the edge of the box, and the point where the three edges intersect is called the vertex of the box. The sum of the six faces of the box is called the surface area of the box.

The volume of a box is a measure of a box, and the volume of a box is equal to the product of length, width, and height.

A three-dimensional figure surrounded by six identical squares is called a cube. A straight parallelepiped with a square side and bottom surface is called a cube, that is, a hexahedron with equal edge lengths, also known as a "cube" or "regular hexahedron".

Cubes are special cuboids. Dynamic definition of a cube: A three-dimensional shape obtained by translating the side length of a square perpendicular to the face of the square.

Surface area of the box and cube:

1. The formula for calculating the surface area of the cuboid:

The surface area of the cuboid = length and width 2 + length and height 2 + width and height 2 The surface area of the box = (length and width + length and height + width and height) 22. The alphabetical formula for the surface area of the box:

s=2ab+2ah+2bh

s=(ab+ah+bh)×2

Note: s represents the surface area of the cuboid, and a, b, and h represent the length, width, and height of the cuboid respectively) 3. The formula for calculating the surface area of the cube is: the surface area of the cube = the edge length of the edge 64, and the alphabetical formula for the surface area of the cube: s=6a2

Note: s denotes the surface area of the cube, a denotes the edge length of the cube) volume volume of the cuboid and cube:

1. The formula for calculating the volume of the cuboid: the volume of the cuboid = length, width and height.

Letter formula: v=a b h.

Note: V represents the volume of the box, A represents the length of the box, B represents the width of the box, and H represents the height of the box).

2. The volume volume of the cube is calculated by formula: the volume of the cube = the length of the edge, the length of the edge, the length of the edge.

Letter formula: v=a3.

3. The volume of the cuboid (or cube) = the height of the base area. Alphabetical formula: v=sh.

Note: v represents the volume, s represents the base area, and h represents the height) 4. Application of the unified volume calculation formula for cuboids and cubes:

According to the formula v=sh, s=v h, h=v s, and any two of these three quantities can be found as the third quantity.

Note that the surface area of the box - the base area 2 = the sum of the areas of the 4 sides.

The area of the 4 sides and = the circumference of the base height.

The formula for the volume of the box: v=abc (volume = length x width x height), and the formula for the surface area of the box: s=2 (ab+bc+ca). The formula for the surface area of the cube: s=6(a), the formula for the volume of the cube: v=a, and a is the edge length.

The formula for the cuboid cube is mainly the formula for calculating the volume and surface area, which are as follows:

1. The formula for the volume of the box: v=abc (volume = length x width x height), because the length x width is the base area of the cuboid, so this formula can evolve to: the volume of the cuboid = the height of the base area, that is, v = sh (s is the base area).

2. Cuboid surface area formula: s=2 (ab+bc+ca) 3. Cube surface area formula: s=6(a), where a*a is the area of a face, and the area of each face of the cube is equal, so it is 6 times.

4. The formula for the volume of the cube: v=a.