“The Chinese Proof” of the Pythagorean theorem (the little orange square is `a²`

, the medium orange square is `b²`

, and the large orange square is `c²`

).

Harald Hanche-Olsen:

The righthand picture above appears in the *Chou pei suan ching* 周髀算經 (ca. 1100 B.C.), for the special (3,4,5) pythagorean triple….

…the earliest known proof of Pythagoras is given by *Zhoubi suanjing* (The Arithmetical Classic of the Gnomon and the Circular Paths of Heaven) (c. 100 B.C.E.-c. 100 C.E.)

…

[T]his proof, with the exclamation `Behold!’, is due to the Indian mathematician Bhaskara II (approx. 1114-1185) …

…

Jöran Friberg … presented convincing evidence that the … Babylonians were aware of the Pythagoras theorem around 1800 B.C.E.

Online Zhoubi Suanjing:

卷上:

句股圓方圖：右圖：左圖：

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