# pi

Given any circle, the ratio of the circumference to the diameter is an irrational number usually referred to as *pi* and denoted by the Greek letter \(\pi\).

This ratio is the same regardless of the size of the circle, and is approximately 3.1415926. Pi is an irrational number, so its decimal representation cannot be finitely represented. Pi is also known to be a transcendental number, which means that it is not the solution of any strictly algebraic equation.

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- [MLA] “pi.”
*Platonic Realms Interactive Mathematics Encyclopedia.*Platonic Realms, 11 Jul 2014. Web. 21 Feb 2018. <http://platonicrealms.com/> - [APA] pi (11 Jul 2014). Retrieved 21 Feb 2018 from the
*Platonic Realms Interactive Mathematics Encyclopedia:*http://platonicrealms.com/encyclopedia/pi/