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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

en.wikipedia.org/wiki/Pi

The number π is a mathematical constant, the ratio of a circle's circumference to its diameter, ... series, was not available until a millennium later, when in the 14th century the Madhava–...

A brief history of pi | PCWorld

www.pcworld.com/article/191389/a-brief-history-of-pi.html

Mar 13, 2013 ... In honor of Pi Day, we bring you a brief history of everyone's favorite ... and its diameter, and it was always there, just waiting to be discovered.

Who discovered pi in math? | Reference.com

www.reference.com/math/discovered-pi-math-6731bb9b0528a07

The identity of the first person to discover that the ratio between the diameter and ... The search for that constant, commonly known as pi, goes back nearly 4,000 ...

Mathematics: Who discovered pi? - Quora

www.quora.com/Mathematics-Who-discovered-pi

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.

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

www.historytoday.com/patricia-rothman/william-jones-and-his-circle-man-who-invented-pi

William Jones and his Circle: The Man who invented Pi ... The discovery that there are two types of irrational numbers, however, does not detract from Jones's  ...

Who Discovered Pi? - Who Discovered It

www.whodiscoveredit.com/who-discovered-pi.html

It is important to know the people who discovered pi, the mathematicians who dedicated their skills in obtaining the value that played a vital role not only in the  ...

The History of Pi - Rutgers Math Department

www.math.rutgers.edu/~cherlin/History/Papers2000/wilson.html

The earliest value of pi used in China was 3. In 263 AD, L iu Hui independently discovered the method used by Bryson and Antiphon, and calculated the ...

Historical Overview of Pi

www.geom.uiuc.edu/~huberty/math5337/groupe/overview.html

The ancient Babylonians knew of the existence of pi ... During the fith century B.C., Hippias of Elis discovered the quadratrix, a curve which could be used to ...

Pi Day: History of Pi | Exploratorium

www.exploratorium.edu/pi/history_of_pi/

Pi has been known for almost 4000 years—but even if we calculated the number of seconds in those 4000 years and calculated pi to that number of places, we ...