How do I find Trig ratios

Trig ratios can only be used on right triangles with acute measures.

If given an angle and there are adjacent and opposite sides, then use tan (opposite/adjacent)

If given an angle and there is an adjacent side and a hypotenuse, then use cosine (adjacent/hypotenuse)

If given an angle and there is an opposite and adjacent side, then use sin (opposite/hypotenuse)

A common mnemonic device used to memorize the trig rules is SOH-CAH-TOA