As you can see, this type of problem requires a diagram of a carefully labeled right triangle. The measurements of the sides and one angle should be labeled based on the information given. One measurement in the triangle is missing. It is the goal of the problem to find this measurement. First you should assign a variable to represent the missing measurement. We usually use a lower case English letter to represent the measure of a side of the triangle and either a Greek letter such as or an upper case English letter to represent a missing angle measurement. A trigonometric ratio often helps us set up an equation which can then be solved for the missing measurement. If the two legs of the triangle are a part of the problem, it is a tangent ratio. If the hypotenuse is part of the problem, it is either a sine or cosine ratio.
