Neil Simon is the eternal funny guy, having churned out more than 30 plays and an equal number of screenplays with more Oscar and Tony nominations than any other writer. ... Right angle triangle ...

The angles in a triangle always add up to 180˚. And a right-angled triangle always has one angle that is 90°, so the other two angles will have a total of 90°. Is it all coming back?

Learn about and revise angles, lines and multi-sided shapes and their properties with this BBC Bitesize GCSE Maths Eduqas study guide.