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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

A photograph of the Greek letter

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

In 1706 a little-known mathematics teacher William Jones first used a symbol to
represent the platonic concept of

www.theguardian.com/science/alexs-adventures-in-numberland/2015/mar/14/pi-day-2015-william-jones-the-welshman-who-invented-pi

Mar 14, 2015

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

May 17, 1999

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

But did you ever wonder where

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

The History of

mathforum.org/library/drmath/view/62626.html

Date: 04/10/2003 at 05:49:07 From: Katharine Subject:

www.straightdope.com/columns/read/2036/who-invented-pi

Sep 17, 2002

www.exploratorium.edu/pi/history_of_pi/

Popular Q&A

Q:
Who invented pi ?

A:
Pi (3.14) has been known for so long that it is quite untraceable. The first theoretical calculation seems to have been carried out by Archimedes of Syracuse.
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Source:
www.kgbanswers.com

Q:
Who invented pi ?

A:
I used to have a book can A History of Pi by Petr Beckmann. In that book he talked about the Egyptians calculating pi so it's at least that old. Although they d...
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Source:
answers.yahoo.com

Q:
Who invented pi ?

A:
Hey for my Algerbra class, our teacher told us that we could get extra credit if we told him Who Invented Pi (mathmatically speaking) so I thought this would be...
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Source:
www.straightdope.com

Q:
Who invented pi ?

A:
Hi: To answer your question you need to know what pi is : It is the ratio of a circle's circumference to it's diameter. it a constant number that never changes ...
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Source:
ph.answers.yahoo.com

Q:
Who invented pi ?

A:
As a mathematical constant, no-one can be said to have invented pi . However the relationship can be said to have been realised to exist and used and exploited f...
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Source:
www.tellmehowto.net