A new angle on ancient trigonometry

A man in a blue suit holding a clay tablet in gloved hands.
Dr Daniel Mansfield with the Plimpton 322 Babylonian clay tablet in the Rare Book and Manuscript Library at Columbia University in New York. (Andrew Kelly/UNSW)

Ancient Greeks were said to have discovered trigonometry. But Australian detective work gives the kudos to the Babylonians, about a thousand years before Pythagoras.

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