## Trigonometry (10th Edition)

a)$60^{\circ}$ b)$150^{\circ}$
a) Formula to find Complement of an angle: $90^{\circ}$ - $X^{\circ}$ $90^{\circ}$ - $30^{\circ}$ = $60^{\circ}$ b) Formula to find Supplement of an angle: $180^{\circ}$ - $X^{\circ}$ $180^{\circ}$ - $30^{\circ}$ = $150^{\circ}$