Answer:
15√3.
Explanation:
This is a 30-60-90 right triangle.
The sides are in the ratio 2:1:√3 where 2 is the hypotenuse, side of length 1 is opposite 30 degree angle and side √3 is opposite the 60 degree angle.
So as the side opposite the 30 degree angle = 15,
x = 15 * √3
= 15√3.