National 5 Using the sine and cosine rules to find a side or angle in a triangle The sine rule The sine rule can be used to find an angle from 3 sides and an angle, or a side from 3 angles and a ...

Cosine and sine of an angle θ are defined to be the x and y-coordinates of the point P on the unit circle with the property that the line from O to P makes and angle θ with the positve x-axis. cos(θ) ...

Mathematics | Trigonometry | Sine and cosine rules Sine and cosine rules Trigonometry is often aligned with right-angled triangles only. However, an understanding of trigonometry can also be extended ...