Identify the reference angle of each given angle.
120°

• A. 30°
• B. 45°
• C. 60°

Answer: (C)

Verified step by step guidance

1. To find the reference angle for any given angle, first determine which quadrant the angle is in. Reference angles are always measured from the x-axis.
2. For an angle of 120°, it is in the second quadrant. The reference angle is found by subtracting the angle from 180°. So, the reference angle is 180° - 120°.
3. For an angle of 30°, it is in the first quadrant. The reference angle is the angle itself, as angles in the first quadrant are their own reference angles.
4. For an angle of 45°, it is also in the first quadrant. Similarly, the reference angle is the angle itself.
5. Thus, the reference angles for 120°, 30°, and 45° are 60°, 30°, and 45° respectively.