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The side AB, which forms part of angle A, is called the side:

AHypotenuse
BVertical
CAdjacent
DOpposite
Answer & Solution
Correct answer: C. Adjacent
1. AB is one arm of angle A. 2. A side that touches the angle is next to it. 3. So AB is the adjacent side. _Source: syllabus Mathematics, Chapter 8, Introduction to Trigonometry._
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