An understanding of the three trigonometric ratios and how to change the subject of a formula is essential. The Greek letter, Ɵ (theta) is often used as a symbol for an unknown angle.

Revise trigonometric ratios of sine, cosine and tangent and calculate angles in right-angled triangles with this Bitesize GCSE Maths Edexcel guide.

Course Objectives: Describe CNC toolpaths Describe coordinates for the lathe Describe the three trigonometric ratios Describe sine, cosine, and tangent Explain how to use right triangles to calculate ...