The sine rule (AQA GCSE Further Maths): Flashcards

Any triangle (not just right-angled)

$\frac{\sin A}{a} = \frac{\sin B}{b} = \frac{\sin C}{c}$

$\frac{a}{\sin A} = \frac{b}{\sin B} = \frac{c}{\sin C}$

To find unknown angles

To find unknown side lengths

Lowercase letters for sides, uppercase for vertices

Two angles + one side or two sides + opposite angle

Two possible angle solutions when using sine rule to find angle

$180° - \text{first angle}$

Only round final answer, not intermediate steps

Check angles sum to $180°$

Longest side