A right-angled triangle will have one angle that is 90°, which means the other two angles will have a total of 90°. A scalene triangle will have all angles of a different size. Back to top ...

Learn how to find the angles in right-angled triangles with this BBC Bitesize Maths article. For students between the ages of 11 and 14.

Many triangles in real life are not right angled. But this does not limit the use of the equation a² + b² = c² because any triangle can be cut into two right-angled ones.

A 3,700-year old Babylonian clay tablet reveals an ancient method of constructing right-angled triangles that makes it the world’s oldest and most accurate trigonometric table.