Because it’s March 14—yes, 3/14—and 3.14 is the value of pi to two decimals. Of course, the actual number continues to an infinite number of decimal places: 3.14159265359 … and so on, forever.

Pi Approximation Day occurs every July 22nd. It celebrates pi, a key mathematical constant. Pi relates a circle's ...

A Pi Day like this won't come around for another century. — -- Circle around, math fans. There's a once-in-a-century Pi Day coming this weekend. The day that celebrates the mathematical ...

National Pi Day is held each year on March 14. It honors 3.14 the ratio of the circumference of a circle. You can also get deals on food too.

Pi is often shortened further to 3.14, but it actually goes on forever. Some genius grasped the idea before I did and started Pi Day — which, of course, is celebrated with pie.

He decided to tackle the (nonexistent) debate on whether you could square a circle. Pi is the ratio of a circle’s circumference to its diameter, which we all know as the infinite number 3.14159265 … ...

Every year, the celebration of Pi Day (March 14 is 3.14) grows more ambitious. Math teachers love to dream up unique classroom activities to celebrate Pi for it endless opportunity to calculate (3 ...

Happy Pi Day. I was trying to think of something cool to do for Pi Day. Last year, I made a numerical simulation to determine the value of Pi. This year, I was stumped. What could I do that was ...

Learn about the definition of pi in relation to a circle with this BBC Bitesize Maths article. For students between the ages of 11 and 14.