Question

What is the reference angle of -139 degrees

Answer 1

41°

Explanation:

Find the acute angle in the first quadrant used as a reference for

−139°.

41°

Answer 2

41º

1) Since we want to find the reference angle for a -139º angle, we need to resort to the following formula

`Reference\:Angle\:\:Quadrant\:III=180^(\circ)-139^(\circ)=41^(\circ)`

2) Note that a -139 angle is in quadrant III, since negative angles are clockwise oriented

3) Thus the Reference Angle is 41º