3√3
Step-by-step explanation:
Below I have attached the template on how to solve 30-60-90 triangles
We see that the hyptonouse has a length equal to 2x which means that
2x= 6√3
x= 3√3
We then see (from the template) that the lenght opposite to the 30 degree angle is equal to x and therefore our answer is just 3√3