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en.wikipedia.org/wiki/Pi

The number π is a mathematical constant. Originally defined as the ratio of a circle's circumference to ...

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

pi=3.14159 26535 89793 23846 26433 83279 50288 41971 69399 37510 58209 74944 59230 78164 06286 20899 86280 34825 34211 70679 82148 08651 ...

www.mathsisfun.com/numbers/pi.html

Draw a circle with a diameter (all the way across the circle) of 1. Then the circumference (all the way around the circle) is 3.14159265... a number known as Pi.

www.piday.org/million

Menu. Pi Day. Celebrate Mathematics on March 14th. 175 Days 17 Hours. Home · Learn About Pi · Shop · Videos · News & Events · Pi Sightings · All Things Pi.

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

Pi is a name given to the ratio of the circumference of a circle to the diameter. That means, for any circle, you can divide the circumference (the distance around  ...

www.scientificamerican.com/article/what-is-pi-and-how-did-it

Regardless of the circle's size, this ratio will always equal pi. In decimal form ... Additionally, pi shows up often unexpectedly in many mathematical situations.

encyclopedia2.thefreedictionary.com/Pie+(math)

pi,. in mathematics, the ratio of the circumference of a circle to its diameter. The symbol for pi is π. The ratio is the same for all circles and is approximately 3.1416  ...

www.ask.com/youtube?q=Math+Pie&v=cC0fZ_lkFpQ
Jul 8, 2014 ... Learn More at mathantics.com Visit http://www.mathantics.com for more Free math videos and additional subscription based content!

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

Apr 30, 2013 ... Pi (π), the 16th letter of the Greek alphabet, is used to represent the most widely known mathematical constant. By definition, pi is the ratio of the ...