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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–...

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

Mar 13, 2013

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

The earliest value of

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

William Jones and his Circle: The Man who invented

www.exploratorium.edu/pi/history_of_pi/

betterexplained.com/articles/prehistoric-calculus-discovering-pi/

May 29, 2008

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

It is important to know the people

britton.disted.camosun.bc.ca/pi/piorigin/piorigin.html

You know what '

www.ualr.edu/lasmoller/pi.html?

The ancient Babylonians generally calculated the area of a circle by taking 3
times the square of its radius (

www.scientificamerican.com/article/what-is-pi-and-how-did-it/

Succinctly,

Answer

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.
More Info

www.reference.com

The identity of the first person to

www.quora.com

If you mean who introduced the symbol

www.geom.uiuc.edu

The ancient Babylonians knew of the existence of