## Trigonometry 7th Edition

$160^{\circ}$ is an obtuse angle. Complement of $160^{\circ}$ = $-70^{\circ}$ Supplement of $160^{\circ}$ = $20^{\circ}$
$160^{\circ}$ is an obtuse angle as angles that measure between $90°$and $180°$ are called obtuse angles. Complement of $160^{\circ}$ = $90^{\circ} - 160^{\circ}$ = $-70^{\circ}$ (As sum of the measures of complementary angles is 90 degrees, we can find 'one' by subtracting 'other' from $90^{\circ}$ ) Supplement of $160^{\circ}$ = $180^{\circ} - 160^{\circ}$ = $20^{\circ}$ (As sum of the measures of supplementary angles is 180 degrees, we can find 'one' by subtracting 'other' from $180^{\circ}$)