Since the trigonometric value of any two congruent angles are always the same (see above “What is a Trig Ratio”), that ratio can be used to help solve for unknown sides of the triangle.

Let’s look at one of our special triangles first.

There are 3 questions to answer to solving for an unknown side\\

- Which side you’re solving for?
- Which angle are you going to use?
- Which trig function (proportion) to use?\\

\textbf{Use }

\

Or