The sides of the right-angled triangles are given special names - the hypotenuse, the opposite and the adjacent.
The hypotenuse is the longest side and is always opposite the right angle. The opposite and adjacent sides relate to the angle under consideration.
There are three formulae involved in trigonometry:
sin = opposite / hypotenuse
cos = adjacent / hypotenuse
tan = opposite / adjacent
Which formula you use will depend on the information given in the question.
There are a couple of ways to help you remember which formula to use. Remember SOHCAHTOA (it sounds like 'Sockatoa')
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