Pi can be calculated using a random sample of darts thrown at a square and circle target.

Swiss researchers said on Monday they had calculated the mathematical constant pi to a new world-record level of exactitude.

On this day of numerical glory, get to know pi in an unusual way: using the elastic collision of two different masses and a wall.

The area of a circle is pi times the radius squared. This is half of a circle with a radius of 1 (no units) such that it would have an area of pi/2.

Using that short version of pi is easy and works fine for simple problems. If you’ve ever used the pi button on a calculator, that probably uses pi rounded to ten decimal places.

Google engineer Emma Haruka Iwao has calculated pi to 31 trillion digits, breaking the world record.

Archimedes’ treatise Measurement of a Circle — which helped spread his process for calculating pi around the world, according to the American Mathematical Society —was part of this manuscript.

The entire school participated in a variety of Pi activities including calculating a variety of circular measurements - from hat sizes, to Pi chains to a student-made "Pi" on the football field ...

This Pi Day, try calculating everyone’s favourite mathematical constant using balls and a cardboard tube, thanks to a mathematical trick involving the balls’ masses ...