I suppose you are wondering what Pi is and what is it used for. Pi is an on going series of numbers that is rounded up to 3.14. The most common use for pi is to find out the circumference of a circle and also the area of a circle.
The
history of pi and its origin page 2
The
history of pi in china
page 3
Pi
today
page 4
A
few decimals of pi
page 5