It’s called an irrational numberbecause it never ends. (Unless you change to a different numbering system – mathematicians like doing that to make life easier when working in spherical universes)
Edited to add: as Michael says below – it’s transcendental as well!
I second Chris’ answer. pi is a classic example of a transcendental number, which is a special sort of irrational number. It cannot be expressed as a fraction (irrational number) and it cannot be expressed as the answer of an algebraic equation with whole number coefficients: http://simple.wikipedia.org/wiki/Transcendental_number
pi is a never ending number, so there can be no last number.
If you ask a scientist what pi equals he/she’ll tell you it equals 3.14159.
If you ask a mathematician what pi equals and he’ll tell you pi equals the circumference of a circle divided by its diameter.
If you ask an Engineer what pi equals he’ll say “Pi? Well, it’s about 3, but we’ll call it 4 just to be safe.”
And if you ask a kid what pi is, he’ll ask if he can have ice cream with it!
For fun I looked up the Pi page on wikipedia. Did you that this number is already quite old? It was apperantely used in the construction of the Pyramids of Giza.
Comments
Chris commented on :
Are the scientists allowed to “Like” answers too 🙂
Michael commented on :
I’d say so… I have been!