Pi is just the name of a particular spot on the number line," Ullman said. "The question really is, 'Isn't it amazing that this number arises in millions of different settings that seem to have ...

Friday is Pi Day, a national celebration of the mathematical concept, which is the ratio of a circle's circumference to its ...

Pi, which is the ratio of a circle's circumference to its diameter, is celebrated with its own holiday on March 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 ...