Pi is an irrational number, which means that it goes on forever without repeating. So I can't really give you the exact value. However, there are several ways of calculating pi.
in terms of a circle: Pi = Circumference/Diameter
for more complicated ways of calculating pi, I would suggest looking at the wikipedia page http://en.wikipedia.org/wiki/Pi
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No. It is a constant. A variable is something that changes value in certain circumstances; pi always has the same value.
3.14
3.14159265 etc. Correct spelling is: Pi no 'e'
The number for pi is: 3.1415926535897932384626433832795
several equations' answers come out to 3.14 and so on, thats pi