Happy Pi Day, the annual celebration of this incredible, mysterious, and irrational mathematical constant. Okay, so Pi — most commonly written as the Greek symbol π — is an essential mathematical ...

So you have a circle. What is the area of that circle? Surely everyone remembers that the area of a circle is: Where Pi (π) is of course the number and r is the radius of the circle. Where does this ...

It was Pi Day, so Billy Logan and JoNell Thomas brought cherry and apple. Others came with peach and blackberry and key lime, laying them out on folding tables on a perfect Saturday morning in the ...

Beth Py-Lieberman - Author, The Object at Hand: Intriguing and Inspiring Stories from the Smithsonian Collections Every year, the celebration of Pi Day (March 14 is 3.14) grows more ambitious. Math ...

WASHINGTON (AP) — Saturday is the day when love of math and a hankering for pastry come full circle. Saturday is Pi Day, a once-in-a-year calendar date that this time squares the fun with a ...

Editor's note: A version of this story was published in March 2011. Get ready to roll out some dough, because it's Pi Day. What's that, you ask? Think back to geometry class. Pi represents the ratio ...

Happy Pi Day, the annual celebration of this incredible, mysterious, and irrational mathematical constant. Happy Pi Day, the annual celebration of this incredible, mysterious, and irrational ...