Pythagoras’ Theorem

What is Pythagoras’ Theorem?

The relationship between the three sides of a right-angled triangle: the square on the hypotenuse, the side opposite the right angle, equals the sum of the squares on the two shorter sides. Written a squared plus b squared equals c squared, with c the hypotenuse, it converts any two known sides into the third, and it applies only where a right angle is given or has been established.

This definition is part of the Trigonometry chapter in Cambridge IGCSE Mathematics.

Concepts related to Pythagoras’ Theorem

• hypotenuse
• surd form
• cosine rule