Pi, a mathematical constant denoted by the Greek letter π, is the ratio of a circle's circumference C to its diameter d: π = C/d. The circumference of a circle is, in turn, equal to 2πr, where r is ...

SAN FRANCISCO -- Every March 14, mathematicians, scientists and math lovers around the world celebrate Pi Day, a commemoration of the mathematical sign Pi. That's because the date written numerically ...

If you are wondering which is better for you—pumpkin pie or sweet potato pie—learn which dessert offers more nutrients and ...

Today marks National Pi Day in the United States and around the world. The holiday commemorates a timeless symbol beloved by many in mathematical and scientific communities, while making the most of ...

When someone wishes you a "Happy Pi Day," you probably immediately think of circles—and not only pies. (Pi Day is March 14, or 3.14 if you’re using US date formatting.) That's because if you measure ...

As math lovers know, it's Pi Day. And what better way to celebrate than by rolling out the dough? An NPR editor known for her experimental baking... Editor's note: A version of this story was ...

Swiss researchers said on Monday they had calculated the mathematical constant pi to a new world-record level of exactitude. The constant π is represented in this mosaic outside the Mathematics ...