and that's the opposite. Circles are ubiquitous in mathematics, so whenever there's a circle, pi will be involved.” Pi shows up everywhere in mathematics and science in places and forms where one ...

It's the ratio between a circle's diameter (the distance between opposite points ... irrational number? Pi Day quiz: How much do you know about this irrational number? Mathematics: Facts about ...

It’s a most auspicious holiday for math lovers. Saturday, March 14, 2015 is Pi Day, a celebration of the irrational number that describes the ratio of a circle’s diameter to its circumference.