Pi is the ratio of the circumference of a circle to its diameter. Regardless of the size of the circle, pi is always the same irrational number: approximately 3.14.
If you can't make it to San Francisco's Exploratorium for the twentieth anniversary of the first Pi Day, you'll find lots here to inspire your own celebration.
"For the sake of usefulness people often need to approximate pi. For many purposes you can use 3.14159, which is really pretty good, but if you want a better approximation you can use a computer to get it."
Eve Andersson is a Google engineer with a soft spot for pi. Her homage to pi includes a Pi Trivia Game consisting of twenty-five randomly chosen questions...
"Besides being a center for teaching ideas and resources, we'll try to be your first stop for funny, smart, tongue-in-cheek tributes to the number pi."
A circle is a shape with all points the same distance from the center.
Euclid proved that this ratio (C/d) is always the same, no matter the size of the circle.
Algebra and geometry tutorials
An article about David Huffman, paper folder EXTRAORDINAIRE!
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