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

Apr 30, 2013

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

www.ask.com/youtube?q=What Is Pi?&v=wNcFAQHJWAU

Dec 16, 2011 ... (π explained) a brief explanation of the constant Pi Pi =3.14159265... C =
circumference = perimeter D = diameter = line dividing circle in half R..

www.piday.org/

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

Popular Q&A

Q:
What is pi ?

A:
What you get when you divide the circumference of a circle by its diameter.
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Source:
answers.yahoo.com

Q:
What is pi ?

A:
pi (π) is an irrational number representing the ratio between the circumference of a circle and its diameter. It is used in many equations (e.g. circle area, sp...
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Source:
wiki.answers.com

Q:
What is 'pi ?

A:
By definition, pi is the ratio of the circumference of a circle to its diameter. Pi is always the same n...
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Source:
www.chacha.com

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