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Pi, written as Π or π, is the 16th letter in the Greek Alphabet.

en.wikipedia.org/wiki/Pi

It has been represented by the Greek letter "π" since the mid-18th century, though
it is also sometimes spelled out as "**pi**" (/paɪ/). Being an irrational number, ...

wonderopolis.org/wonder/what-is-pi/

Before we can learn more about

mathforum.org/dr.math/faq/faq.pi.html

www.mathsisfun.com/numbers/pi.html

Draw a circle with a radius of 1. The distance half way around the edge of the
circle will be 3.14159265... a number known as

www.youtube.com/watch?v=wNcFAQHJWAU

Dec 16, 2011

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

Apr 30, 2013

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

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

100,000 Digits of

www.math.utah.edu/~pa/math/pi.html

Popular Q&A

Q:
What is pi for?

A:
it is used to calculate the area and volume of a circle or cylinder. also to find circumference. EX: DIAMETER X PI = CIRCUMFERENCE.
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Source:
wiki.answers.com

Q:
What is pi ?

A:
pi (π) is an irrational number. It is used in many equations (eg. circle area, circumference, the Archimedes algorithm, Vieta's Formula, Liebnitz's Formula, Wal...
Read More »

Source:
wiki.answers.com

Q:
What is pi ?

A:
Pi is the ratio of the circumference of a circle to its diameter. It'll always be the same number,...
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Source:
www.chacha.com

Q:
What is pi ?

A:
The numerical value of Pi truncated to 50 decimal places is: 3.14159 26535 89793 23846 26433 83279 50288 41971 69399 37510.
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Source:
www.chacha.com