Mathematics Resources by Topic - Number
Pi
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Pi on the Web

The Pi Pages

The Joy of Pi

About Pi - Math Forum

Pi Page - Yahoo

History of Pi - MacTutor History Archive

chronology of pi
calculations of pi over the years

10000 digits of pi

1250000 digits of pi

comparing the diameter and circumference of a circle
This Java applet lets you roll circles one complete revolution.

fraction approximations for pi

Archimedes' estimate of pi

arctan formulas for pi
Ron Knott derives different arctan formulas and demonstrates the connection with the Fibonacci numbers.

Pi Movie
reciting 139 digits of pi while juggling

Pi or Archimedes' Constant - MathSoft Constants

Numbers, constants and computation
history of methods of calculating pi including geometric, series and iterative methods