Any mathematician will use the number pi (and its symbol) sooner or later - it is a number used extensively in many different areas of mathematics.
Since pi is an irrational number it is impossible to represent the exact quantity as a decimal; you can only give and approximate value. However, if you write a fraction that includes the symbol for pi, you are giving an exact quantity.
The first time the symbol Pi was first used for Pi was in ancient Greece in their numbers. The symbol "π" was number 80 in Greece.
Pi is an irrational number. As such, it has an infinite number of digits.
Archimedes
I don't know how to represent the symbol here on WikiAnswers, but you can see it here: http://en.wikipedia.org/wiki/Pi
"Pi" is the symbol almost always used to represent the ratioof the circumference of any circle to its diameter.
The symbol for pi (π), is the Greek letter that is the equivalent to the Roman p. It is the Greek letter pi. It is the first letter of the Greek word περίμετρος (perimetros) from which our word perimeter comes.
Leonhard Euler used the symbol pi in 1737.
the number is that you use for pi is 3.14 the number is that you use for pi is 3.14
He was responsible for instituting the use of the symbol pi.
Yes, if you're calculating circumference from radius or diameter. Pi is the symbol used to represent the ratio of circumference to diameter of any circle: pi = c/d This can also be written as c = pi*d. And has been noted, pi is approximately 3.14