europe civilisation 8 papyrus_rhind_pb53

Here is a proof of Thales Theorem known to the Egyptians 1,100 years before Thales was born. This is Problem 53 of the Rhind Mathematical Papyrus, reproduced by Egyptian scribe Yahmesu from the documents of the Middle Kingdom and kept today at the British Museum.
Source: Civilization or Barbarism (French version), Check Anta Diop, page 311

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