We all learned in school about the Pythagorean theorem: in a right triangle, the square of the hypotenuse equals the sum of the squares of the other two sides. Despite the name, this theorem probably wasn’t discovered by Pythagoras; the Egyptians, Mesopotamians, Indians, Chinese, and other Greeks all had a hand in developing it.
Here are some resources to learn more about the Pythagorean theorem:
- Maor, Eli. (2007). The Pythagorean Theorem: A 4,000-Year History. Princeton University Press.
- Swetz, Frank; Kao, T. I. (1977). Was Pythagoras Chinese?: An Examination of Right Triangle Theory in Ancient China. Pennsylvania State University Press.
- Cut the Knot. Pythagorean Theorem. https://www.cut-the-knot.org/pythagoras/ (122 proofs of the theorem visualized).
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