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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, ..... The first infinite sequence discovered in Europe was an infinite product (rather than a...

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 ... and its diameter, and it was always there, just waiting to be discovered.

Mathematics: Who discovered pi? - Quora

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

Mar 10, 2013 ... If you mean who introduced the symbol pi in the public it was Euler.The following article though says a different story. William Jones and his ...

Where Does 'PI' Come From?

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

You know what 'PI' is ... it's a number with the value 3.14, and it's used to find the ... Mathematicians who discovered this, thousands of years ago, were amazed!

Who discovered pi in math? - Ask.com

www.ask.com/math/discovered-pi-math-6731bb9b0528a07

The identity of the first person to discover that the ratio between the diameter and the circumference of a given circle is a constant will probably never be known.

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.

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

William Jones and his Circle: The Man who invented Pi ... The discovery that there are two types of irrational numbers, however, does not detract from Jones's  ...

Prehistoric Calculus: Discovering Pi – BetterExplained

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

May 29, 2008 ... Archimedes found pi to 99.9% accuracy 2000 years ago — without decimal points ... I wish I learned his discovery of pi in school — it helps us ...

4 Ways to Discover Pi for Yourself Using Circles - wikiHow

www.wikihow.com/Discover-Pi-for-Yourself-Using-Circles

How to Discover Pi for Yourself Using Circles. How was the math constant called "pi" discovered -- and could you have discovered it? Well, yes, with a bit of ...

What is Pi? - Geometry Made Easy! - Quatr.us

quatr.us/math/geometry/pi.htm

Pi is a number that is approximately equal to 3.14. It is the number you get if you divide the circumference of any circle by its diameter. It's the same for all circles.

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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The History of Pi

www.math.rutgers.edu

The earliest value of pi used in China was 3. In 263 AD, L iu Hui independently discovered the method used by Bryson and Antiphon, and calculated the ...

Historical Overview of Pi

www.geom.uiuc.edu

The ancient Babylonians knew of the existence of pi ... During the fith century B.C., Hippias of Elis discovered the quadratrix, a curve which could be used to ...

Pi Day: History of Pi | Exploratorium

www.exploratorium.edu

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 ...