1. Pi
A Brief History

2. History of pi ( )
Pi is a very old number. We know that the Egyptians and the Babylonians knew about the existence of the constant ratio pi, although they didn't know its value nearly as well as we do today. They had figured out that it was a little bigger than 3; the Babylonians had an approximation of 3 1/8 (3.125), and the Egyptians had a somewhat worse approximation of 4*(8/9)^2 (about ), which is slightly less accurate and much harder to work with.

3. Why pi?
Pi (rather than some other Greek letter like Alpha or Omega) was chosen as the letter to represent the number because the letter [  ] in Greek, pronounced like our letter 'p', stands for 'perimeter'.

4. Brief History of Pi

5. The ratio of the circumference of a circle to its diameter.
What is ?
The ratio of the circumference of a circle to its diameter.
Circumference
diameter

6. The numbers to the right of the 3 never repeat in a pattern.
3.14 and Beyond…
The numbers to the right of the 3 never repeat in a pattern.

7. Fun Facts about
Hiroyuki Goto, 21, the current world record holder for the most digits of Pi memorized, required over nine hours to recite digits
The modern symbol for pi was first used in our modern sense in 1706 by William Jones
Pi Day is celebrated on March 14th

8. Humor

9. “Probably no symbol in mathematics has evoked as much mystery, romanticism, misconception and human interest as the number pi.” William L. Schaaf, Nature and History of Pi