![]() Crockett Johnson based his painting on a diagram in Ivor Thomas’s article on Greek mathematics in The World of Mathematics, edited by James R. However, knowing a theorem is different from demonstrating it, and the first surviving demonstration of this theorem is found in Euclid’s Elements. It was known to the Babylonians centuries before then. Although the method of the proof depicted was written about 300 BC and is credited to Euclid, the theorem is named for Pythagoras, who lived 250 years earlier. This painting depicts the “windmill” figure found in Proposition 47 of Book I of Euclid’s Elements. ![]() Object Details referenced Euclid painter Johnson, Crockett Description The Pythagorean theorem states that in any right triangle, the square of the side opposite the right angle (the hypotenuse), is equal to the sum of the squares of the other two sides. Eliot Elisofon Photographic Archives, African Art. ![]()
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