Understanding different types of angles and that angles in a triangle sum to 180° can be helpful when classifying a triangle. Recognising line symmetry and rotational symmetry will also help. Look for ...

The sides of right-angled triangles are labelled opposite, hypotenuse and adjacent. Trigonometry explores the relationship between sides and angles in right-angled triangles. The hypotenuse is the ...

Space to play or pause, M to mute, left and right arrows to seek, up and down arrows for volume. They all have straight rays or sides if they're part of a shape and a vertex, that's the point where ...