Learn about Pythagoras' theorem with this BBC Bitesize Maths ... triangles Learn about three trigonometric ratios in similar right-angled triangles with this BBC Bitesize Maths article.

Pythagoras' theorem - Edexcel Pythagoras’ theorem can be used to calculate the length of any side in a right-angled triangle. Pythagoras’ theorem can be applied to solve 3-dimensional problems.