Pi | Definition, Symbol, Number, & Facts | Britannica
https://www.britannica.com/science/pi-mathematics
WebMar 14, 2024 · pi, in mathematics, the ratio of the circumference of a circle to its diameter. The symbol π was devised by British mathematician William Jones in 1706 to represent the ratio and was later popularized by Swiss mathematician Leonhard Euler. Because pi is irrational (not equal to the ratio of any two whole numbers), its digits do not repeat, and ...
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