alleryA reference angle is the smallest positive acute angle formed with which axis?
AThe hyperbolic axis
BThe heightwise axis
CThe halfway axis
DThe horizontal axis
Answer & Solution
Correct answer: D. The horizontal axis
1. The reference angle is measured from an axis, not from the origin ray.
2. It is taken to the nearer part of one particular axis.
3. A reference angle is the smallest positive acute angle formed by the terminal side and the horizontal axis.
4. So the answer is the horizontal axis.
_Source: OpenStax 'Algebra and Trigonometry 2e', Ch 7 'The Unit Circle: Sine and Cosine Functions'_
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