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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