This mathematics problem involves applying core mathematical principles and formulas. Below you will find a complete step-by-step solution with detailed explanations for each step, helping you understand not just the answer but the method behind it.

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Answer
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Step 1: Identify the angle and the sides of the right-angled triangle. The angle in question is . The sides are labeled , , and . Side is the hypotenuse, as it is opposite the right angle. Sides and are the perpendicular sides (legs) of the triangle.
Step 2: Determine which perpendicular side is adjacent to . The side opposite to angle is . The side adjacent to angle (and not the hypotenuse) is .
The perpendicular side adjacent to the angle is .
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This mathematics problem involves applying core mathematical principles and formulas. Below you will find a complete step-by-step solution with detailed explanations for each step, helping you understand not just the answer but the method behind it.