Trigonometric ratio

Always give an example of what you are trying to do. It will be far easier to show you what to do and how to do it.

In this example:

The opposite of 20° is 65, and the hypotenuse is x

Therefore

$sin 20°= \frac{65}{x}$

$x = \frac{65}{sin20°}$

Which is about 190.05