The Sine Rule (Leaving Cert Mathematics): Flashcards

Any triangle (not just right-angled)

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

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

One side-angle pair + one other side or angle

On top of fractions

On top of fractions

Inverse sine ($\sin^{-1}$)

Degree mode

Side to sine of opposite angle ratio is constant

$180°$

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