It is important to remember other angles rules, such as angles on a straight line add up to 180°, and to recognise angles in parallel lines. Make sure you are confident in applying Pythagoras’ theorem ...

An understanding of how to use Pythagoras’ theorem to find missing sides in a right-angled triangle is essential for applying the theorem in different contexts. (3,1) is the coordinate that is 3 along ...

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Arctan, or arctangent, is one of the inverse trigonometric functions that relates the angle of a right-angled triangle to its opposite and adjacent sides. In general, arctan(x) represents the angle ...