0 Take the Pi Day Challenge

National Pi Day, March 14
Photo credit: CBS News
Happy Pi Day!

Every March 14 (aka 3.14), we embrace the *irrational* (see what I did there), by celebrating the Greek letter Pi (π) — the symbol for the ratio of the circumference of a circle to its diameter.

Thanks to technology, Pi has been calculated to over 1 trillion digits past the decimal, or:

211055596446229489549303819644288109756659334461...and that's quite enough of that.

The Pi Day Challenge was created by a team of math geeks for those of us who love logic-based puzzles.

> Take the 2011 Pi Day Challenge

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