Algebra-2

Question Analysis
This problem assesses the understanding of the sine values in special right triangles, specifically in a 30-60-90 triangle.

Key Concept Explanation
In a 30-60-90 triangle, the sides are in the ratio 1 : : 2. The sine of the 60-degree angle is the ratio of the length of the opposite side (which is times the shortest side) to the hypotenuse.

Step-by-step Solution
1. Given: The hypotenuse is 18 units.
2. In a 30-60-90 triangle, the sine of the 60-degree angle is always