The Book of Weekly Parallel Calculations uses the simplest and most feasible method to determine the astronomical calendar, and reveals the running laws of the sun, the moon and the stars, including the changes of seasons and climate, as well as the fact that the north and south poles push each other day and night. It provides a powerful guarantee for the life and rest of the latecomers. Since then, mathematicians of all ages have been innovating and developing on the basis of the Classic of Weekly Parallel Computing.

The formula of Pythagoras theorem is clearly recorded in the classic "Weekly Parallel Computing": "If you want evil from the sun, take the sun as a hook, take the height of the sun as a share, multiply Pythagoras and divide it by the square, and you will have to ask evil from the sun."

Significance of Pythagorean Theorem

Pythagorean theorem is a basic geometric theorem, which means that the sum of the squares of two right angles of a right triangle is equal to the square of the hypotenuse. In ancient China, right-angled triangles were called Pythagorean Theorem, the smaller right-angled side was a hook, the other longer right-angled side was a chord, and the hypotenuse was a chord, so this theorem was called Pythagorean Theorem, and some people called it quotient height theorem.

There are about 500 ways to prove Pythagorean theorem, and Pythagorean theorem is one of the most proven theorems in mathematics. Pythagorean theorem is one of the important mathematical theorems discovered and proved by human beings in the early days. It is one of the most important tools to solve geometric problems with algebraic ideas, and it is also one of the ties of the combination of numbers and shapes.