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 ...

Next, think about the relationship between sine, cosine and the circle. Here's an illustration of the fundamental relationship between the three. Notice how the crank moves in a circle, ...

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 ...