The reference angle for an angle, x, measuring 150° in the second quadrant is 180 - x
What is a reference angle?
The reference angle is the angle between the terminal side of the angle and the x-axis.
The reference angle for the angle in the second quadrant = 180 - angle.
The angle 150° is in the second quadrant, hence:
Reference angle = 180° - 150° = 30°
The reference angle for an angle, x, measuring 150° in the second quadrant is 180 - x
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