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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.