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Chinese pythagorean theorem. Need to identify source (year)
Visual proof for the (3, 4, 5) triangle as in the Chou Pei Suan Ching 500–200 BC.
Left sentence: 勾股幂合以成弦幂 (gōu gǔ chéng mì hé yǐ chéng xián chéng)
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Category: Chinese public domain photographs