Algebra-2

Question Analysis
This problem assesses the understanding of the cosine function in a right triangle, specifically the ratio of the adjacent side to the hypotenuse.

Key Concept Explanation
The cosine of an angle in a right triangle is defined as the ratio of the length of the adjacent side to the length of the hypotenuse. Mathematically, this is expressed as: .

Step-by-step Solution
1. Identify the given values: adjacent side = 20 units, hypotenuse = 30 units.
2. Apply the cosine formula:

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