The formula for calculating the square is: rectangle: rectangle area = length × width, square: square area = side length × side length.

Squaring is an operation. For example, the square of A means a×a, which can be abbreviated as A, or it can be written as A× A (the first power of A times the first power of A equals the second power of A), for example, 4×4= 16, 8×8=64, and the square symbol is 2.

Square is a mathematical operation. For any real number x, it can be expressed as the square of x, that is, x? . The specific calculation of 800 square meters can be carried out according to the following steps: 1. 800 square meters, that is, 800? . Secondly, the results are divided into two parts, namely, 8×8× 100 and 1× 1× 100.

Third, calculate the first part, that is, 8×8× 100=6400. Finally, calculate the second part, namely/kloc-0 /×/kloc-0 /×100 =100. Add these two parts to get the square of 800, which is 6400+ 100=6500. So 800 squared is 6500.

The function and significance of mathematics;

1. Solving practical problems: Mathematics is a tool that can help us solve many practical problems, such as calculating costs, solving geometric problems, making statistical analysis and forecasting.

2. Cultivate thinking ability: Mathematics is an effective way to cultivate thinking ability. By studying mathematics, we can exercise our logical reasoning ability, abstract thinking ability, imagination and creativity, and improve our ability to solve problems.

3. Promote the study of other disciplines: Mathematics is the foundation of many other disciplines, such as physics, chemistry and computer science. Mastering the basic knowledge of mathematics is helpful for us to better understand and apply the knowledge of these subjects.

4. Application in society: Mathematics has a wide range of applications in society, such as finance, economy, engineering, science and medicine. In these fields, mathematics is used to analyze and solve problems, which provides more convenience and guarantee for our lives.