Algebra-2

Question Analysis
This problem evaluates the understanding of the properties of a 30-60-90 triangle and the cosine function.

Key Concept Explanation
In a 30-60-90 triangle, the sides are in the ratio 1:√3:2. The cosine of the 30-degree angle is:

Step-by-step Solution
1. Identify the given value: hypotenuse = 20 units.
2. Use the cosine of 30 degrees:
3. Set up the equation:

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