
The ratio of the opposite side of a right triangle to the hypotenuse the sine and give it the symbol
sin = o / hThe ratio of the adjacent side of a right triangle to the hypotenuse is called the cosine and given the symbol
cos = a / hFinally, the ratio of the opposite side to the adjacent side is called the tangent and given the symbol
tan = o / a 
If we knew at least one of each part of the ratio we could find the answer.
good picture, good start with summary. you need a symbol for the angle (or a number example) in your equations.
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