Question

reference angle of 150 degree
30
110
150
180

Explanation:

Step1: Recall reference angle rule for second quadrant

For an angle \( \theta \) in the second quadrant (\( 90^\circ < \theta < 180^\circ \)), the reference angle is \( 180^\circ - \theta \).

Step2: Apply the formula to \( \theta = 150^\circ \)

Substitute \( \theta = 150^\circ \) into the formula: \( 180^\circ - 150^\circ = 30^\circ \).

Answer:

30 (corresponding to the orange option with value 30)