There are three main trigonometric functions - Sine θ (sin θ), Cosine θ (cos θ) and Tangent θ (tan θ). Sin θ - Ratio of P erpendicular to H ypotenuse. Cos θ - Ratio of B ase to H ypotenuse ...

In National 4 Maths Trigonometry is used to find the size of a missing side or angle in a right-angled triangle using the sine, cosine or tangent ratios ...

National 5; Using the sine and cosine rules to find a side or angle in a triangle How to know which formula to use. The sine rule can be used to find an angle from 3 sides and an angle, or a side ...