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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.
en.wikipedia.org/wiki/Pi

Some approximations of

mathforum.org/isaac/problems/pi1.html

Historians estimate that by 2000 B.C. humans had noticed that the ratio of circumference to diameter was the same for all circles. This discovery hinged on the ...

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

100,000 Digits of

math.stackexchange.com/questions/588141/how-is-the-value-of-pi-pi-actually-calculated

Dec 1, 2013

wiki.c2.com/?ValueOfPi

Seriously, it does make sense to define "

www.mathscareers.org.uk/article/calculating-pi/

Ancient and modern methods can be used to calculate

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

You know what '

www.livescience.com/29197-what-is-pi.html

Apr 30, 2013

www.wikihow.com/Calculate-Pi

The reason this is called a Limit is because the result of it is 'limited' to