For example- Sin 60° = √Fingers below 60° finger/2 = √3/2 Cos 90° = √Fingers above 90° finger/2 = √0/2 = 0 To calculate the tan ratios, flip the hand and assign the angles as shown below.

From our ship-mast example before, the relationship between an angle and its tangent can be determined from its graph, shown below. The graphs of sine and cosine are included as well.

Learn and revise trigonometric ratios of sine, cosine and tangent and calculate angles and lengths in right-angled triangles with GCSE Bitesize AQA Maths.

Revise how to use the sine and cosine rules to find missing angles and sides of triangles as part of National 5 Maths.