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5

Set 3: Trigonometry (Intermediate)

Explanation

Answer: C

PROBLEM

Researchers have observed that what is the reference angle for 150 degrees?

What is the reference angle for 150 degrees?

A.

150 degrees

B.

60 degrees

C.

30 degrees

✓ Correct
D.

150 degrees

Detailed Explanation

[Variation 3] Choice C is the best answer. Reference angle for 150 degrees is 30 degrees

Why others are wrong:
A: 150 degrees is incorrect because it does not satisfy the equation.
B: 60 degrees is incorrect because it does not satisfy the equation.
D: 150 degrees is incorrect because it does not satisfy the equation.
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