Answer:
14.7
Explanation:
You want the side opposite the 60° angle in a right triangle with hypotenuse 17.
Sine
The sine relation is ...
Sin = Opposite/Hypotenuse
Solving for the opposite side gives ...
Opposite = Hypotenuse × Sin
x = 17·sin(60°) ≈ 14.7
The missing side is about 14.7.