Pi or ð is the ratio of a circle's circumference to its diameter in Euclidean geometry, approximately 3.14159. Pi is a mathematical constant and a transcendental (and therefore irrational) real number, with many uses in mathematics, physics, and engineering. It is also known as Archimedes' constant (not to be confused with an Archimedes number) and as Ludolph's number.
The name of the Greek letter ð is pi, and this spelling is used in typographical contexts where the Greek letter is not available or where its usage could be problematic. When referring to this constant, the symbol ð is always pronounced like "pie" in English, the conventional English pronunciation of the letter. In Greek, the name of this letter is pronounced slightly differently.
The constant is named "ð" because it is the first letter of the Greek words ðåñéöÝñåéá 'periphery' and ðåñßìåôñïò 'perimeter', i.e. 'circumference'.
ð is Unicode character U+03C0 ("Greek small letter pi".
[Edited by yosup, 10/14/2007 7:24:13 PM]
a topic about pie that reached 16 pages...this should have been thread of the year
(just kidding ryan please dont fire me >_>)
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