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Bearing
A bearing is an angle measured clockwise from the North direction, usually written using three digits (for example, $135^\circ$).
Sine rule
For any triangle $ABC$, $$\frac{\sin A}{a}=\frac{\sin B}{b}=\frac{\sin C}{c}$$
Equivalently, $$\frac{a}{\sin A}=\frac{b}{\sin B}=\frac{c}{\sin C}$$