The unit of area is very common in life and will be easier to use. However, in real life, the unit of measurement of these areas is generally not the square meters of mathematics majors, but hectares. The conversion formula of hectares is that one hectare equals 10,000 square meters. The nickname of hectare is 100 square meter, but it is more convenient and easier to understand in real life. Especially when measuring the land area, it is easy to use the word hectare. For example, the landing area of a park will be measured in hectares on the publicity map, which is common.