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 ...

Pi, the ratio of a circle's circumference to its diameter, approximately 3.1415. While some people may opt for a slice of pie to mark the occasion, others take a deeper dive into the fascinating ...

Ben Orlin: Pi is a beautiful number that, in its simplest form, is the ratio of a circle’s circumference to its diameter. The distance around the outside will be much further than the distance ...

March 14 is Pi Day, an annual celebration of the mathematical constant of pi, representing the ratio of a circle's circumference to its diameter. The holiday is observed on March 14 or 3/14 ...

Friday is Pi Day, a national celebration of the mathematical concept, which is the ratio of a circle's circumference to its diameter and equals 3.14... Schools and museums often plan events to ...

Years ago, the infinite decimal 3.14 or its Greek symbol pi was mostly known to math and science geeks, but now March 14 is also a day for tasty deals.