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Pi Day

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Tuesday on "City Lights with Lois Reitzes":

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Monday on "Closer Look with Rose Scott and Jim Burress":

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March 14, 2015 – or 3/14/15 in month/day/year format – may sound kind of familiar to you math geeks out there. Those are the first five numbers of the mathematical constant pi.

“It’s not defined relative to anything that humans have created, like feet or meters or inches.  It’s just a ratio of the circumference of a circle to the diameter of a circle,” says Dr. Bill Graham, math professor at the University of Georgia.

He says even though pi has been around for thousands and thousands of years, there are still mysteries surrounding it.

Pi Day: Math Geeks Mark A Once In A Century Observance

Mar 13, 2015
Ga. Tech. professor David Goldsman and Denis O'Hayer, with pi computed to one million digits.
Jason Parker / WABE

Mathematics aficionados mark Pi Day every year on March 14, but this year is different.

For the first time in a century, Pi Day falls on March 14, 2015 (3-14-15) making it a once in a lifetime observance that won’t happen again for another 100 years.

Pi, symbolized by the 16th letter of the Greek alphabet and spelled out in English as pi, is a constant, never-changing number that measures a circle’s circumference to its diameter.