Celebrate Pi Day and read all about how this number pops up across math and science on our special Pi Day page. Grab something circular, like a cup, measure the distance around the circle, and divide ...

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 ...

Conversations about understanding maths in modern life continue long after Pi Day – whether you celebrated it or not. Each year on 14 March, classrooms, cafés, and science centres buzz with number ...