Find the reference angle for the given angle.
-$399 ^ { \circ }$
A) $39 ^ { \circ }$
B) $141 ^ { \circ }$
C) $129 ^ { \circ }$
D) $51 ^ { \circ }$

Question

Quizplus · Accepted Answer

The reference angle for any angle is the acute angle (less than $90^\circ$) made with the x-axis. For $399^\circ$, we subtract full rotations (360 degrees) to get $399^\circ - 360^\circ = 39^\circ$, which is the reference angle.

Find the Reference Angle for the Given Angle 399∘399 ^ { \circ }399∘

Find the Reference Angle for the Given Angle $399 ^ { \circ }$