The area of a triangle (AQA GCSE Further Maths): Flashcards

Capital letters $A$, $B$, $C$

Lowercase letters $a$, $b$, $c$ (opposite to corresponding vertices)

Vertex $A$

$\frac{1}{2}bc \sin A$

Half product of 2 sides × sine of angle between them

Two sides and the angle between them

$\frac{1}{2}ac \sin B$

$\frac{1}{2}ab \sin C$

The angle between the two sides chosen

Degree mode (unless radians specified)

$\text{cm}^2$ or $\text{m}^2$

$360° \div 5 = 72°$