Basic Trigonometry (AQA A-Level Mathematics): Quizzes

When you have two angles and one side

When you have three sides

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

$c^2 = a^2 + b^2 - 2ab \cos C$

$\cos C = \frac{a^2 + b^2 - c^2}{2ab}$

$\text{Area} = \frac{1}{2}ab\sin C$

8.57 cm

111.5°

12 square cm

Cosine Rule