If the cosine of an angle in a right triangle is $$ \frac{1}...

Question Analysis
This problem tests the ability to use the cosine function to find the length of a side in a right triangle.

Key Concept Explanation
The cosine of an angle in a right triangle is the ratio of the length of the adjacent side to the length of the hypotenuse. This is expressed as .

Step-by-step Solution
1. Given: