Explain how to find the length of the side of any right triangle when you know two of the side lengths

You have to add the two side lengths you know and subtract them from 190.

Example:

The two sides of the triangle you know are 47° and 50°.

47+50 = 97

190-97 = 93

In this example, the length of the side you don't know is 93.

Does this answer your question?

You can use the pythagorean theorem

leg^2 + leg^2 = hypotenuse^2