Area of a Triangle (HSC SSCE Mathematics Standard): Flashcards

Two sides and the included angle

The angle between the two sides being used

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

Side-Angle-Side (two sides + included angle)

Degree mode

$\sin C = \frac{h}{a}$

$h = a \sin C$

Must be the included angle (between the two sides)

Vertices: $A$, $B$, $C$; opposite sides: $a$, $b$, $c$

Half × two sides × sine of included angle