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

en.wikipedia.org/wiki/Pi

The number π is a mathematical constant, the ratio of a circle's circumference to
its diameter, commonly approximated as 3.14159. It has been represented by ...

wonderopolis.org/wonder/what-is-pi

Before we can learn more about pi, it will help if we review a bit of geometry. In
particular, we need to brush up on circles. Why? Well, we'll get around (pun ...

www.mathsisfun.com/numbers/pi.html

circle radius=1, half circumference=pi. Draw a circle with a radius of 1. The
distance half way around the circle is 3.14159265... a number known as Pi ...

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

Apr 30, 2013 ... Pi represents the ratio of the circumference of a circle to its diameter. Pi is an
irrational number that never ends; the decimals go on forever and ...

www.piday.org/million/

One Million Digits of Pi. 3.14... more digits loading... More Pi Stuff. Digits: New Pi
Calculation Record Set · pi-time · Digits: Pi Day Clock · fugue · Videos: A fugue ...

www.piday.org/learn-about-pi/

Pi (π) is the ratio of a circle's circumference to its diameter. Pi is a constant
number, meaning that for all circles of any size, Pi will be the same. The diameter
of a ...

quatr.us/math/geometry/pi.htm

May 2016 - Pi is a number that is approximately equal to 3.14. It is the number
you get if you divide the circumference of any circle by its diameter. It's the same ...

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

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