Phy.org - Science: Math: Recreations: Specific Numbers: Pi

A Common Book of Pi - Includes a brief history, a page with different formulas and a list of references.
A New Approach to the Universal Constant "pi" - A text that tries to prove that pi is 3.1416 exactly.
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.
A Tribute to Pi - Club and information.
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.
Ask Dr. Math: About Pi - Explains what the constant is and a brief history. Includes resource links.
Buffon's Needle - An analysis of its relation to Pi and a simulation by George Reese.
Calculating Pi - An open source endeavor for the calculation of this constant. Describes the project, the implemented algorithms for calculation and software downloads.
Elias' Pi Page - Includes Pi in the Binary number system, Pi as a sound file and Pi shown in different images.
Fun With Pi - A Topica email list. Archives readable by anyone.
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.
How Stuff Works: Pi - Animated graphic helps to explain Pi and the different ways of calculating Pi, with some related links.
Lucy Scale Developments - Pitch, Pi, and other musical paradoxes.
Pi 3.1416 - Mathematics as the language of nature.
Pi Approximation Day - 22/7 - that is, July 22. For the past few years, people at Chalmers University have celebrated it.
Pi Land - Fun activities, a Pi trivia game and a Trainer for digit memorization. Pi poetry, artwork, and photography, calculations, digits and book reviews.
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.
Pi, Pi, Mathematical Pi - Parody of the song "Bye Bye Miss American Pie" elaborating on the history of pi.
Pi Through the Ages - History.
Pi-Dye : Pi and Math T-Shirts and Gifts - Pi and math gifts, t-shirts, clocks, and mugs. Includes some pi news.
The Constant Pi - History, formulae, algorithms, programs, records of computation, and references.
The Joy of Pi - Book, digits, links, facts, and quote.
The Magic Piworld - Provides generated pictures and personal signs out of digits of Pi. Also a Picture Gallery, PiSign, PiPhonie.
The Pi Trivia Game - History, math, and physics questions.
The Ridiculously Enhanced Pi Page - Information on links for Pi Day.
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.

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