π
A number represented by the [b]𝜋[/b] symbol. It is the ratio of a circle's circumference to its diameter, roughly equal to 3.14159 (this number is infinite and non-repeating, or an irrational number). This means that a circle's circumference (the entire circle itself) is a little more than three times as long as its diameter (a straight line running through the circle).

h4. Pi and pi approximations 

* Pi: 3.14159265358979323846
* 22/7: 3.14285714285714285714

h4.See also

* [[Tag Group:Symbols]]
* "Wikipedia: Pi":[http://en.wikipedia.org/wiki/Pi]
pi (math)