March 14: Pi Day

It's Pi Day on March 14

The annual celebration commemorates the mathematical constant π (pi), which, of course (!), is the ratio of a circle's circumference to its diameter.

It's March 14 (or 3/14) because 3, 1 and 4 are the three most significant digits of π in the decimal form: 3.14159 26535 89793 23846 26433 83279 50288 41971 69399 37510 58209 74944 59230 78164 06286 20899 86280 34825 34211 70679 etc, etc.

So, now you know!


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