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See also:

• Science: Math: Geometry: Plane Geometry  (5)

• 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.
• 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 calculatinon and software downloads.
• A Common Book of Pi - Includes a brief history, a page with different formulas and a list of references.
• The Constant Pi - History, formulae, algorithms, programs, records of computation, and references.
• Dale's Pi Page - Includes history of Pi, songs and jokes, poems, news and the first 1,000,000 digits.
• Earth Mysteries : Notes on Pi - An introduction to the number Pi and its history.
• 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.
• Harry Smith's Brief History of Pi Calculations - Brief history of Pi calculations from the ancient times to present day.
• 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 Pi? - Extracting the digits of pi from the SlOka
• How Stuff Works: Pi - Animated graphic helps to explain Pi and the different ways of calculating Pi, with some related links.
• Indiana Pi Bill - Bill proposing new value of pi.
• The Joy of Pi - Book, digits, links, facts, and quote.
• Land of Pi - Pi digits, random links, and some downloads.
• Lucy Scale Developments - Pitch, Pi, and other musical paradoxes.
• The Magic Piworld - Provides generated pictures and personal signs out of digits of Pi. Also a Picture Gallery, PiSign, PiPhonie.
• A New Approach to the Universal Constant "pi" - A text that tries to prove that pi is 3.1416 exactly.
• Paul's Page of Pi - Includes introduction on why people would want to calculate Pi, four methods for calculating it, over 8000 digits, poems and music.
• 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 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.
• The Pi Pages - Information on Pi, its history, its future, and the people involved in its calculations.
• Pi Patterns - Images and illustrations created by using the digits of the circle constant.
• Pi, Pi, Mathematical Pi - Parody of the song "Bye Bye Miss American Pie" elaborating on the history of pi.
• The Pi Song - Written by Joel Gilmore. (Sung to the tune of Supercalifragilisticexpialidocious.)
• Pi Through the Ages - History.
• The Pi Trivia Game - History, math, and physics questions.
• 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-Dye : Pi and Math T-Shirts and Gifts - Pi and math gifts, t-shirts, clocks, and mugs. Includes some pi news.
• The Ridiculously Enhanced Pi Page - Information on links for Pi Day.
• 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.
• 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.
• A Tribute to Pi - Club and information.
• The Uselessness of Pi and its Irrational Friends - Clubs, links, memorizing technique, records, art, and programs.
• 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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