The Greek letter pi represents the mathematical constant that equals a circle's circumference divided by its diameter.
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."
Mr. Herte, a math teacher at Carle Place High School, in Carle Place, NY, says Pi Day "gives us the perfect springboard to allow our students to have fun while investigating mathematics concepts, being creative, and even a little silly."
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."
Euclid proved that this ratio (C/d) is always the same, no matter the size of the circle.
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