Find the reference angle for the given angle.
-$81 ^ { \circ }$
A) $99 ^ { \circ }$
B) $81 ^ { \circ }$
C) $9 ^ { \circ }$
D) $171 ^ { \circ }$

Question

Quizplus · Accepted Answer

The reference angle for an angle in standard position is the acute angle formed by the terminal side of the angle and the x-axis. For angles between 0° and 90°, the reference angle is the angle itself, hence $81^\circ$ is its own reference angle.

Find the Reference Angle for the Given Angle 81∘81 ^ { \circ }81∘

Find the Reference Angle for the Given Angle $81 ^ { \circ }$