A rectangle is a two-dimensional figure with two equal sides, usually called length and width. The characteristic of a rectangle is that the opposite sides are equal and the four corners are right angles. Rectangle is also a special case of rectangle, with the same length and width.

A cuboid is a geometric shape with six faces, which consists of three dimensions: length, width and height. Its bottom is rectangular, or it can be said to be a two-dimensional rectangle. The six faces of a cuboid are all rectangles, and the areas of the opposite faces are equal and exactly the same. Two of them can be squares, four can be rectangles and six can be rectangles.

In the field of mathematics, cuboid is also a very important figure, which is the basis of many mathematical concepts, such as area, perimeter and so on. As a book introducing mathematics knowledge, the shape of a mathematics book should be a cuboid.

Features of a cuboid:

1 has six faces: all six faces of a cuboid are rectangles, which means that it is a very regular geometric shape and can be easily calculated and analyzed. In architecture, cuboid is widely used to design various buildings because of its simple shape and easy calculation. In physics, cuboids are often used to describe the physical properties of objects such as volume, mass and center of gravity.

2. There are twelve sides: a cuboid has twelve sides, and adjacent faces are connected together to form a cuboid structure. These sides can be equal or unequal, depending on the specific shape and size of the cuboid. In geometry, the side length of a cuboid is often used to describe its shape and size.

3. There are eight vertices: a cuboid has eight vertices, which are the corners of the cuboid, and their connection forms the structure of the cuboid. These vertices can also be used to describe the shape and size of the cuboid, for example, by calculating the distance from the vertex to the origin to describe the position and direction of the cuboid.

4. All faces are rectangles: all faces of a cuboid are rectangles, including vertices and edges. This means that every face has two equal long sides and two equal short sides.