## Trigonometry (10th Edition)

a. $30^{\circ}$ b. $120^{\circ}$
a. 90$^{\circ}$ - $60^{\circ}$= $30^{\circ}$ complementary angles have a sum of $90^{\circ}$ b. $180^{\circ}$- $60^{\circ}$ = $120^{\circ}$ supplementary angles have a sum of $180^{\circ}$