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Pi

en.wikipedia.org/wiki/Pi

The number π is a mathematical constant, the ratio of a circle's circumference to its diameter, ..... Liu later invented a faster method of calculating π and obtained a value of 3.14 w...

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 named William Jones first used a symbol to represent the platonic concept of pi, an ideal that in numerical terms can ...

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 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 ...

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 irrational constant.

William Jones: The First Math Teacher to Use Pi | Mental Floss

mentalfloss.com/article/49290/william-jones-first-math-teacher-use-pi

Mar 12, 2013 ... Eighteenth-century mathematician William Jones had a problem with pi—namely, it didn't exist yet. At the time of his working and teaching in ...

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.

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 ...

Mathematics: Who discovered pi? - Quora

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

Mar 10, 2013 ... William Jones used the name Pi for the Greek letter meaning the ... Euler invented many mathematical notations which are still employed today.

Who invented pi? - Quora

www.quora.com/Who-invented-pi

Dec 5, 2013 ... Pi was not "invented". A lot of people have contributed to its discovery over the ages. The value of Pi was first required to measure the area of ...

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

www.theguardian.com

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 ...

Pi Day: History of Pi | Exploratorium

www.exploratorium.edu

Pi has been known for almost 4000 years—but even if we calculated the ... area of a circle by taking 3 times the square of its radius, which gave a value of pi = 3.

The History of Pi

www.math.rutgers.edu

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