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The earliest known textually evidenced approximations of pi date from around 1900 BCE; they are 25/8 (Babylonia) and 256/81 (Egypt), both within 1% of the true value.
The Greek letter pi was first used to represent the ratio of the circumference of a circle to its diameter in 1709 by mathematician William Jones.

Pi - Wikipedia


The number π is a mathematical constant, the ratio of a circle's circumference to its diameter, ..... A photograph of the Greek letter pi, created as a large stone mosaic embedded in. The c...

William Jones and his Circle: The Man who invented Pi | History Today


In 1706 a little-known mathematics teacher named William Jones first used a symbol to represent the platonic concept of pi, an ideal that in numerical terms can ...

Who invented pi? | Reference.com


A mathematics teacher named William Jones is credited with first using the symbol π in 1706 to represent the concept of the ratio between a circle's ...

Pi Day 2015: meet the man who invented π | Science | The Guardian


Mar 14, 2015 ... Pi Day 2015: meet the man who invented π. Gareth Ffowc Roberts. Anglesey- born William Jones was the first person to use the Greek letter π ...

Where Does 'PI' Come From?


But did you ever wonder where PI came from? Did somebody make it up? Was it invented? Where does it come from!? PI is a truly magical number! The symbol ...

What is pi, and how did it originate? - Scientific American


Succinctly, pi--which is written as the Greek letter for p, or --is the ratio of the circumference of any circle to the diameter of that circle. Regardless of the circle's  ...

Mathematics: Who discovered pi? - Quora


If you mean who introduced the symbol pi in the public it was Euler.The following article though ... William Jones and his Circle: The Man who invented Pi.

Who Invented pi!!! - YouSigma


Aryabhattä gave an accurate approximation for pi (P), as 3.1416 and introduced the inverse sine function into trigonometry.

The History of Pi


The History of Pi. David Wilson History of Mathematics Rutgers, Spring 2000. Throughout the history of mathematics, one of the most enduring challenges has  ...