Answer:
![sin 40 = (x)/(11)](https://img.qammunity.org/2022/formulas/mathematics/high-school/im9c2y6l3k7cc9cau9wdaiiwjf9eezsvxs.png)
Explanation:
![sine = (opposite)/(hypotenuse)](https://img.qammunity.org/2022/formulas/mathematics/high-school/4cbq4iewy2bq2t97ocn12n0b6v3dc861kq.png)
Side x is the opposite, since it is opposite the angle you are solving for.
Side y is the adjacent, since it is next to the angle you are solving for.
The side measuring 11 is the hypotenuse, since it is across from the right angle.