In China, Shang Gao during the Shang Dynasty proposed a special case of the Pythagorean theorem of "three strands, four strands, and five strands". In the West, the first person to propose and prove this theorem was the Pythagoreans in ancient Greece in the 6th century BC. He used deduction to prove that the square of the hypotenuse of a right triangle is equal to the sum of the squares of the two right-angled sides.

There are currently about 500 ways to prove the Pythagorean theorem, which is one of the theorems with the most proof methods among mathematical theorems. The Pythagorean Theorem is one of the important mathematical theorems discovered and proved by mankind in the early days. It is one of the most important tools for solving geometric problems using algebraic thinking, and is also one of the links between numbers and shapes. Extended information

1. The proof of the Pythagorean theorem is the beginning of the demonstration of geometry;

2. The Pythagorean theorem is the first theorem in history to connect numbers and shapes, that is, It is the first theorem to connect geometry and algebra;

3. The Pythagorean theorem led to the discovery of irrational numbers, caused the first mathematical crisis, and greatly deepened people's understanding of numbers;

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4. The Pythagorean Theorem is the first indefinite equation in history to give a complete solution. It leads to Fermat’s Last Theorem;

5. The Pythagorean Theorem is a result of Euclidean geometry. Basic theorem and has huge practical value. This theorem is not only a dazzling pearl in geometry and is known as the "cornerstone of geometry", but it is also widely used in advanced mathematics and other scientific fields. On May 15, 1971, Nicaragua issued a set of stamps entitled "Ten mathematical formulas that changed the face of the world". These ten mathematical formulas were selected by famous mathematicians, and the Pythagorean theorem was the first of them.

Reference: Baidu Encyclopedia-Pythagorean Theorem