Happy Pi Day! It's March 14, or 3/14, matching the first three digits of π. π is one of the fundamental constants of mathematics: the ratio of a circle's circumference to its diameter. π is an ...

The number represented by pi (π) is used in calculations whenever something round (or nearly so) is involved, such as for circles, spheres, cylinders, cones and ellipses. Its value is necessary to ...

Google Doodle 2026: Google is marking March 14 with a special Doodle dedicated to Pi Day 2026. It's an annual shout-out to the world's most famous mathematical constant, π. Google stated it was ...

Who was the first person to calculate pi? The first person to realise that, hang on, when you divide the circumference of a circle by its diameter, you always seem to get the same number, namely ...