Pi

Ancient Pi: Knowers of the Universe
The concept of pi refers to the constant ratio of the diameter:circumference of any circle; irrespective of the number of degrees contained within that circle. An article in the "Science in Ancient Artwork"-Series by Charles William Johnson.
http://www.earthmatrix.com/ancient/pi.htm

Ask Dr. Math - Pi
Dr Math answers over 60 questions submitted by people about pi including questions on the Bible's relationship to it and its relationship to trigonometry.
http://mathforum.org/library/drmath/sets/mid_pi.html

Ask Dr. Math: About Pi
Explains what the constant is and a brief history. Includes resource links.
http://mathforum.org/dr.math/faq/faq.pi.html

Buffon's Needle
An analysis of its relation to Pi and a simulation by George Reese.
http://www.mste.uiuc.edu/reese/buffon/buffon.html

Calculating Pi
An open source endeavor for the calculation of this constant. Describes the project, the implemented algorithms for calculatinon and software downloads.
http://sourceforge.net/projects/projectpi/

A Common Book of Pi
Includes a brief history, a page with different formulas and a list of references.
http://personal.bgsu.edu/~carother/pi/Pi1.html

The Constant Pi
History, formulae, algorithms, programs, records of computation, and references.
http://numbers.computation.free.fr/Constants/Pi/pi.html

Dale's Pi Page
Includes history of Pi, songs and jokes, poems, news and the first 1,000,000 digits.
http://www.geocities.com/SiliconValley/Pines/5945/

Earth Mysteries : Notes on Pi
An introduction to the number Pi and its history.
http://witcombe.sbc.edu/earthmysteries/EMPi.html

Elias' Pi Page
Includes Pi in the Binary number system, Pi as a sound file and Pi shown in different images.
http://www.befria.nu/elias/pi/

Fun With Pi
A Topica email list. Archives readable by anyone.
http://lists.topica.com/lists/funwithpi@igc.topica.com/

Harry Smith's Brief History of Pi Calculations
Brief history of Pi calculations from the ancient times to present day.
http://www.geocities.com/hjsmithh/Pi/Records.html

History and Philosophy of Pi
Probably no symbol of infinity in mathematics has evoked as much mystery, romanticism, misconception and human interest as the number and Greek letter of Pi. Interesting facts and trivia about Pi.
http://briantaylor.com/Pi.htm

How Pi?
Extracting the digits of pi from the SlOka
http://www.geocities.com/ResearchTriangle/Facility/4118/misc/pi.html

How Stuff Works: Pi
Animated graphic helps to explain Pi and the different ways of calculating Pi, with some related links.
http://www.howstuffworks.com/pi.htm

Indiana Pi Bill
Bill proposing new value of pi.
http://tafkac.org/legal/indiana_pi_bill.html

The Joy of Pi
Book, digits, links, facts, and quote.
http://www.joyofpi.com/

Land of Pi
Pi digits, random links, and some downloads.
http://www.geocities.com/landofpi/

Lucy Scale Developments
Pitch, Pi, and other musical paradoxes.
http://www.harmonics.com/lucy/ltindex.html

The Magic Piworld
Provides generated pictures and personal signs out of digits of Pi. Also a Picture Gallery, PiSign, PiPhonie.
http://www.piworld.de/piworld/mpw_home.htm

A New Approach to the Universal Constant "pi"
A text that tries to prove that pi is 3.1416 exactly.
http://alkyone.com/mak-pi-gr/en/

Pi 3.1416
Mathematics as the language of nature.
http://www.freewebs.com/pi3point1416/

Pi Approximation Day
22/7 - that is, July 22. For the past few years, people at Chalmers University have celebrated it.
http://www.rebas.se/humor/piapprox.shtml

Pi Land
Fun activities, a Pi trivia game and a Trainer for digit memorization. Pi poetry, artwork, and photography, calculations, digits and book reviews.
http://www.eveandersson.com/pi/

Pi Memorama
Includes a program that teaches Pi for the Mac, a page on why people learn to recite Pi and pages on how to memorise Pi.
http://www.ac.wwu.edu/~mnaylor/pi.html

The Pi Pages
Information on Pi, its history, its future, and the people involved in its calculations.
http://oldweb.cecm.sfu.ca/pi/pi.html

Pi Patterns
Images and illustrations created by using the digits of the circle constant.
http://www.antigravitypress.com/Math/pi/

Pi, Pi, Mathematical Pi
Parody of the song "Bye Bye Miss American Pie" elaborating on the history of pi.
http://www.vvc.edu/ph/TonerS/mathpi.html

The Pi Song
Written by Joel Gilmore. (Sung to the tune of Supercalifragilisticexpialidocious.)
http://www.physics.uq.edu.au/people/gilmore/humour/the-pi-song/

Pi Through the Ages
History.
http://www-groups.dcs.st-and.ac.uk/~history/HistTopics/Pi_through_the_ages.html

The Pi Trivia Game
History, math, and physics questions.
http://www.eveandersson.com/trivia/

Pi World Ranking List
Every sport has its championship. Every sport has its world ranking list. For many who like to memorize numbers, PI is the ultimate number, and it makes sense to create a list for people to get in touch and learn where they stand in the world of memorizers.
http://www.pi-world-ranking-list.com/

Pi-Dye : Pi and Math T-Shirts and Gifts
Pi and math gifts, t-shirts, clocks, and mugs. Includes some pi news.
http://www.pidye.com/thestorezone/index.php

The Ridiculously Enhanced Pi Page
Information on links for Pi Day.
http://www.exploratorium.edu/pi/

A Slice of Pi Home Page
Features an historic overview of the discovery and estimate methods of pi. formula expressions, and the first 100,000 digits. Some pages use a Geometer's Sketchpad program.
http://www.geom.uiuc.edu/~huberty/math5337/groupe/welcome.html

Three141, a BBP Ruby implementation and a portal about Pi
A Ruby implementation of BBP (Bailey-Borwein-Plouffe formula) and a portal about the Pi. The BBP formula calculates the nth digit of pi without having to retain all the previous digits.
http://www.314159265358979323846264338327950288419716939937510.net

A Tribute to Pi
Club and information.
http://www.acc.umu.se/~olletg/pi/trib.htm

Your Piece of the Pi
This site describes pi's history, characteristics, and application. It also includes a distributed computing application for finding a large number of digits.
http://library.thinkquest.org/C0110195