Happy National Pi Day Math lovers rejoice. Friday is March 14 — that's 3-14. Pi, 3.14, is the ratio used to compute the circumference of a circle. It's also pronounced pie — making it the appropriate day to eat pie.

## Happy National Pi Day

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Happy National Pi Day

# Happy National Pi Day

## Happy National Pi Day

• `<iframe src="https://www.npr.org/player/embed/289994189/289994190" width="100%" height="290" frameborder="0" scrolling="no" title="NPR embedded audio player">`
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Math lovers rejoice. Friday is March 14 — that's 3-14. Pi, 3.14, is the ratio used to compute the circumference of a circle. It's also pronounced pie — making it the appropriate day to eat pie.

DAVID GREENE, HOST:

And today's last word in business: Pi in the Sky.

Today, March 14th, 3-14, is Pi Day. In case you didn't know, it's actually a national holiday - certainly an important day for math lovers. In Austin, festivities started early - with skywriting. A company called AirSign tried to write the long famous ratio across 100 miles of sky. It turned out writing Pi in the Sky was a little easier.

RENEE MONTAGNE, HOST:

In San Francisco, there's the Pi Procession. If you show up, you'll get a number, one through 9, and line up in the order of Pi. And from coast to coast, bakeries, of course, of course, are offering Pi Day specials.

GREENE: And, of course, there are some great jokes - Pi jokes. Renee, did you know that 3.14 percent of sailors are Pi rates?

MONTAGNE: Great joke, David.

GREENE: Thank you. Good for a Friday.

(LAUGHTER)

MONTAGNE: Great.

GREENE: That's the business news on MORNING EDITION from NPR News. I'm David Greene.

MONTAGNE: And I'm Renee Montagne.

(SOUNDBITE OF MUSIC)

UNIDENTIFIED MAN: (Rapping) ...we also need to know called Pi - mathematical concepts, they everywhere. Why?