the sides of the triangle:
1. Hypotenuse : the longest side, opposite right angle.
2. Adjacent: the side next to the missing angle [or the known angle {but not the right angle}- if you're trying to find a side length]
3. Opposite : the side opposite the missing angle [or the known angle {but not the right angle}- if you're trying to find a side length]
Sin(angle) = Opp/Hyp
Cos(angle) = adjacent/hyp
tan(ange) = opp/adjacent
{rearrange these equations to make any unknown the subject}