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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 - Wikipedia

en.wikipedia.org/wiki/Pi

Some approximations of pi include: Integers: 3; Fractions: Approximate fractions include (in order of increasing accuracy) ...

## Math Forum: Finding the Value of Pi

mathforum.org/isaac/problems/pi1.html

Historians estimate that by 2000 B.C. humans had noticed that the ratio of circumference to diameter was the same for all circles. This discovery hinged on the ...

## 100,000 Digits of Pi

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

100,000 Digits of Pi Pi Logo. 3.141592653589793238462643383279502884197169399375105820974944592307816406286  ...

## circle - How is the value of \$\pi\$ ( Pi ) actually calculated ...

math.stackexchange.com/questions/588141/how-is-the-value-of-pi-pi-actually-calculated

Dec 1, 2013 ... in the Diagram we have a circle of circumference 2[Pi]r , and inscribed in it a .... by keeping n=1000 you will get value of pi=3.14158748587.

## Value Of Pi

wiki.c2.com/?ValueOfPi

Seriously, it does make sense to define "pi" as a defined constant - not because it changes, but ... PiEqualsThree, for small values of Pi, or large values of 3.

## Calculating Pi (π) - Maths Careers

www.mathscareers.org.uk/article/calculating-pi/

Ancient and modern methods can be used to calculate PI. ... Someone had to come up with the approximate value for Pi (π) which appears on your calculator - it ...

## 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 circumference and area of a circle. But did you ever wonder where PI came ...

## What is Pi? - Live Science

www.livescience.com/29197-what-is-pi.html

Apr 30, 2013 ... When starting off in math, students are introduced to pi as a value of 3.14 or 3.14159. Though it is an irrational number, some use rational ...

## 5 Ways to Calculate Pi - wikiHow

www.wikihow.com/Calculate-Pi

The reason this is called a Limit is because the result of it is 'limited' to pi. As you increase your number x, the result will get closer and closer to the value of pi.