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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, ... Ancient civilizations needed the value of π to be computed accurately for practical ...

## 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 ...

## The History of Pi

www.math.rutgers.edu/~cherlin/History/Papers2000/wilson.html

... string of numbers starting with 3.14159 2653..., which is generally shortened to 3.14. ... The people who initiated the hunt for pi were the Babylonians and Egyptians, nearly 4000 years ago. .... The earliest value of pi used in China was 3 .

## Pi - Math is Fun

www.mathsisfun.com/numbers/pi.html

Pi (the symbol is the Greek letter π) is: The ratio of the ... 314.159...m. = 314m (to the nearest m) ... Activity: Find an Approximate Value For Pi · Circle Radians ...

## Why is Pi (actually) Important

www.angio.net/pi/whypi.html

Why is Pi interesting to understand, compute, and perhaps even to search? ... Archimedes used this trick with 96 sided polygons to correctly estimate Pi to about two digits (3.14), proving 3.1408 < Pi < 3.1428. You can try ... Year, Digits, Value.

## geometry - Why is \$\pi \$ equal to \$3.14159...\$? - Mathematics Stack ...

math.stackexchange.com/questions/17366/why-is-pi-equal-to-3-14159

Jan 13, 2011 ... You will get something like 3.14.. Pi unrolled. Now let ..... Moron's answer is more suited for the question (to bound the value above and below).

## Why is 3.14 frequently used as the value of Pi, and not 22/7? - Quora

www.quora.com/Why-is-3-14-frequently-used-as-the-value-of-Pi-and-not-22-7-Wouldnt-it-affect-the-correctness-of-the-value

It's important to note that pi is not equal to 22/7. In fact, we can't even write pi as a fraction, no matter what numbers you stick in the numerator/denomin...

## Value Of Pi

c2.com/cgi/wiki?ValueOfPi

PiEqualsThree, for small values of Pi, or large values of 3. ... read somewhere long ago that the state legislature of a mid-western state legally defined pi as 3.14.

## PI - Math.com

www.math.com/tables/constants/pi.htm

Pi is a name given to the ratio of the circumference of a circle to the diameter. ... the needle lands on a line, it turns out to be directly related to the value of Pi.

## Why 22/7 is a better π day than 3.14 | Tangential Thoughts

robbieg8s.wordpress.com/2013/03/15/why-227-is-a-better-π-day-than-3-14/

Mar 15, 2013 ... On March 14th, i tweeted "Surely today is American pi day. ... for the same number of digits, if by better you mean “closer in absolute value”.

### What is pi, and how did it originate? - Scientific American

www.scientificamerican.com

May 17, 1999 ... Regardless of the circle's size, this ratio will always equal pi. In decimal form, the value of pi is approximately 3.14. But pi is an irrational number ...

### A brief history of pi | PCWorld

www.pcworld.com

Mar 13, 2013 ... Everybody knows the value of pi is 3.14…er, something, but how many people know where the ratio came from? Actually, the ratio came from ...

### What is Pi? - Live Science

www.livescience.com

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 ...