SOHCAHTOA
Sin A = Opposite/Hypotenuse
Cos A = Adjacent /Hypotenuse
Tan A = Opposite/Adjacent
Remember you can use these ratios if you have a right triangle. Angle A refers to either of the two acute angles in the triangle but not the right angle. If you do not have enough info to use the Pythagorean Theorem, try using these trig ratios to solve the triangle.
Real Math In A Minute 