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The side opposite one acute angle of a right triangle is, for the other angle, the:
AApparent side
BAngular side
CAverage side
DAdjacent side
Answer & Solution
Correct answer: D. Adjacent side
1. A right triangle has two acute angles.
2. Each leg plays a different role for each of them.
3. The side opposite one acute angle is the side adjacent to the other acute angle, and vice versa.
4. So the answer is the adjacent side.
_Source: OpenStax 'Algebra and Trigonometry 2e', Ch 7 'The Unit Circle: Sine and Cosine Functions'_
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