Home / Events on 5 March / William Oughtred Birthday
English mathematician who is credited to have invented the slide rule for multiplication and division. He was also the first to use ‘x’ as the symbol for multiplication and abbreviating sine and cosine to "sin" and "cos".
Oughtred was also the first to propose using the sixteenth letter of the Greek alphabet, π, as the symbol for pi, the ratio of the circumference of a circle to its diameter. FYI, Pi Day is celebrated on 14th March which is also the birthday of Albert Einstein.
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