Pythagoras' theorem

This article discusses how every Pythagorean triple (a, b, c) can be illustrated by a square and an L shape within another square. You are invited to find some triples for yourself.

A description of some experiments in which you can make discoveries about triangles.

This article is about triangles in which the lengths of the sides and the radii of the inscribed circles are all whole numbers.

What is the relationship between the arithmetic, geometric and harmonic means of two numbers, the sides of a right angled triangle and the Golden Ratio?

Read all about Pythagoras' mathematical discoveries in this article written for students.

This article for pupils and teachers looks at a number that even the great mathematician, Pythagoras, found terrifying.

Pythagoras of Samos was a Greek philosopher who lived from about 580 BC to about 500 BC. Find out about the important developments he made in mathematics, astronomy, and the theory of music.

Liethagoras, Pythagoras' cousin (!), was jealous of Pythagoras and came up with his own theorem. Read this article to find out why other mathematicians laughed at him.