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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

en.wikipedia.org/wiki/Pi

A photograph of the Greek letter pi, created as a large stone mosaic embedded in .... Liu later invented a faster method of calculating π and obtained a value of ...

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

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

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

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

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 ...

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

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

May 17, 1999 ... 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.

Where Does 'PI' Come From?

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

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 ...

The History of Pi

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

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

Why Was Pi Invented? - Math Forum - Ask Dr. Math

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

Date: 04/10/2003 at 05:49:07 From: Katharine Subject: Pi - why was it even invented?? Dr. Math, I don't understand why pi was invented in the first place. I know ...

The Straight Dope: Who invented pi?

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

Sep 17, 2002 ... Dear Straight Dope: Hey for my Algerbra class, our teacher told us that we could get extra credit if we told him Who Invented Pi (mathmatically ...

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 ...

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. Read More »
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... Read More »
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... Read More »
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 ... Read More »
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... Read More »
Source: www.tellmehowto.net