# Pi Day

14.3.13 is Pi Day, an international day of mathematical celebration!

Why? Thanks to the North American custom of writing the date backwards, there is a day in March that looks like the circle constant pi 3.14… but looks can be deceiving. Hosted by Australian Numeracy Ambassador, Simon Pampena schools across the nation linked up via video conference to uncover the Secrets of Pi.

It was a day of pi-oneering maths comedy, pi-les of mathematical fun and of course pi-ems… that’s poems ode to pi!

**What is Pi?**

Pi is represented by the Greek letter π, and it is one of the most important numerical constants in mathematics. If the radius, r, of a circle is known then π can be used to compute the area and the circumference of the circle.

AREA = πr^{2}

CIRCUMFERENCE = 2πr

Without pi there is no theory of motion and no understanding of geometry. For instance, the volume of a sphere of radius r is 4/3πr^{3} and that of a cylinder of height h is πr^{2}h.

Pi occurs in important fields of applied mathematics such as Fourier analysis and image reconstruction. It is used throughout engineering, science and medicine and is studied for its own sake in number theory.

Pies for Pi Day at the Australian Museum sponsored by: