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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.

## 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  ...

## Historical Overview of Pi

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

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 ...

## Who discovered pi in math? - Ask.com

The identity of the first person to discover that the ratio between the diameter and ... The search for that constant, commonly known as pi, goes back nearly 4,000 ...

## 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 ...

## 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 ...

## 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.

## 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 ...

## The amazing history of pi - University of Arkansas at Little Rock

www.ualr.edu/lasmoller/pi.html

That the ratio of the circumference to the diameter of a circle is constant (namely, pi) has been recognized for as long as we have written records. A ratio of 3:1 ...

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.

### Where Does 'PI' Come From?

britton.disted.camosun.bc.ca

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!

### 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 ...

### Mathematics: Who discovered pi? - Quora

www.quora.com

Mar 10, 2013 ... Euclidean geometry, attributed by Greek mathematician Euclid (born 325 BC) was the first recorded system used to show Pi as a mathematical ...