Answer:
180° -x
Step-by-step explanation:
The reference angle is the smallest positive angle between the terminal ray and the x-axis. For a 2nd-Quadrant angle such as 150°, the reference angle is ...
180° -x
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If your answer choice is really 180' -x, then the correct answer is "none of the above." 180' is 3°, since there are 60 minutes in a degree.
