What is fortune-telling Pythagorean Theorem _ Fortune-telling Pythagorean Theorem?

What is the Nine Chapters of Arithmetic divided into? What are the main chapters about?

The main contents of "Nine Chapters Arithmetic" are:

Chapter 1 "Square field": calculation of field area;

Chapter two "millet": conversion of grain proportion;

Chapter 3 "Decline": the problem of proportional distribution;

Chapter 4 "Less but Wide": Given the area and volume, find its side length, diameter length, etc.

Chapter 5 "commercial engineering": geotechnical engineering and volume calculation;

Chapter VI "lose-lose": reasonable allocation of tax revenue;

Chapter seven "surplus and deficiency": the problem of dual management;

Chapter 8 "Equation": the problem of linear equations;

Chapter 9 Pythagorean Theorem: Various problems solved by Pythagorean Theorem.