Applications of Trigonometric Functions (Grade 12 NSC Matric Mathematics): Quizzes

Two sides & included angle known, no height

Two angles & one side are given

When all three sides are known

Cosine rule

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

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

When $\sin C$ gives two possible angle values

Opposite the largest angle

Draw a clear 3D diagram

Leads to accumulation of errors