Non-Right-Angled Triangles (Edexcel A-Level Mathematics): Flashcards

It finds unknown sides or angles in any triangle.

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

With AAS, ASA, or SSA conditions.

Finding unknown sides or angles in any triangle.

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

For SAS or SSS triangle conditions.

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

$C$ is the angle between sides $a$ and $b$ of a triangle.

Two angles and one side or two sides with a non-included angle.

Area = $0.5 \cdot a \cdot b \cdot \sin(C)$ for sides $a$, $b$ and angle $C$.