A brief history of Pythagorean theorem
In BC 1 1 century, Shang Gao, a mathematician in Zhou Dynasty, put forward "hook 3, strand 4, string 5". A dialogue between Shang Gao and Duke Zhou was recorded in The Book of Balance Calculation in Zhou Dynasty. Shang Gao said: "... so fold the moment, tick three, fix four, and cross the corner five." Meaning: When two right-angled sides of a right-angled triangle are 3 (hook) and 4 (chord) respectively, the radius angle (chord) is 5.
In the future, people will simply say that this fact is "three strands, four chords and five". According to this allusion, Pythagorean theorem is called quotient height theorem.
In the 3rd century A.D., Zhao Shuang in the Three Kingdoms period made a detailed annotation on the Pythagorean theorem in Nine Chapters Arithmetic in The Book of Changes, and Zhao Shuang created the Pythagorean square diagram, which is a combination of form and number, and gave a detailed proof of the Pythagorean theorem. Later, Liu Hui also proved the Pythagorean theorem in Liu Hui's notes.
Hua Hua, a mathematician in China in the late Qing Dynasty, put forward more than twenty proofs of Pythagorean theorem.
Extended data
The significance of the discovery of Pythagorean theorem;
1, the proof of Pythagorean theorem is the beginning of demonstrating geometry;
2. Pythagorean theorem is the first theorem in history that connects numbers with shapes, that is, the first theorem that connects geometry with algebra; ?
3. Pythagorean theorem led to the discovery of irrational numbers and the first mathematical crisis, which greatly deepened people's understanding of logarithms; ?
4. Pythagorean theorem is the first indefinite equation in history to give a complete solution, which leads to Fermat's last theorem;
5. Pythagorean theorem is the basic theorem of Euclidean geometry and has great practical value. This theorem is not only a dazzling pearl in geometry, but also widely used in advanced mathematics and other scientific fields.
1971May 15, Nicaragua issued a set of stamps entitled "Ten Mathematical Formulas for Changing the World". These ten mathematical formulas are all selected by famous mathematicians, and Pythagorean theorem is the first one.