Perimeter formula: the sum of four sides can be side length ×4, where "A" means side length and "C" means the perimeter of a square, then C=a×4. Area formula: the square of the side length, the side length is "A" and the square area is "S", then S = A 2. Diagonal formula: the square root of the side length is multiplied by 2, and the side length is represented by "a", and "v" is the diagonal of a square, so v=√2a.

The importance of the square formula is as follows:

1, Basic knowledge of geometry: Square is one of the basic figures in geometry, and any research on it is inseparable from the relevant formulas of square. These formulas provide a basis for more complex geometric knowledge in the future. Practical application: Square formula is widely used in real life. For example, in the field of architecture and design, it is often necessary to calculate the area and perimeter of a square.

2. Correctly applying the square formula can help us to finish these calculations quickly and accurately. Teaching value: Square formula is an important content in mathematics teaching, which plays an important role in cultivating students' logical thinking, spatial imagination and problem-solving ability. By learning the square formula, students can deepen their understanding of the basic knowledge of mathematics and improve their ability to apply mathematics.

3. The beauty of mathematics: the square formula shows the beauty of simplicity and symmetry of mathematics. For example, the square area formula A 2 (where A is the side length) shows the exponential beauty of mathematics. This kind of beauty stimulates people's interest and love in mathematics and promotes the development of mathematics. Promote the development of other disciplines: as the basic knowledge in the field of mathematics, the square formula is not only of great significance in mathematics.

4. It also has influence on other disciplines. For example, in physics, the motion of particles on a square lattice can be described by a square formula; In computer science, the square formula is applied to image processing, computer graphics and other fields. Historical significance: the development of square formula reflects the process of human exploration of mathematics and geometry.