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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  ...