Today is "Pi" Day - March 14, 2012
1. the 16th letter of the greek alphabet (II, π).
2. the consonant sound represented by this letter.
3. Mathematics
a. The letter π, used as the symbol for the ratio of the circumference of a circle to its diameter.
b. the ratio itself: 3.141592+.
Dictionary.com
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Enjoy this tutorial. If this is just a little too much, celebrate by having a slice of pie.
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