In construction, Trigonometry is used to show how stress and force are directed along supports which are not vertical or horizontal. It is alos used to find the lengths of such components of a...
Generally pre-calculus is taken after trigonometry, unless the trigonometry course was supplemented by a pre-calculus course, in which case the next course would be calculus.
usually its used to find a missing angle or length of a right triangle. Of course there is more to trigonometry. any way you can use sine, cosine, and tangent, to fine the missing angle or length