Examples include:
validating the line of sight evidence of witnesses.
calculating the angle of a shot being fired and therefore the direction from which a shot was fired. If several shots were fired in a small time interval (so the shooter was more or less in the same place), the shot trajectories identify his/her location.
in the case of blunt instrument injury, calculating the angle of impact can give some indication of the relative heights of the victim and assailant.
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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.
Trigonometry is the study of plane and spherical triangles. Plane trigonometry deals with 2 Dimensional triangles like the ones you would draw on a piece of paper. But, spherical trigonometry deals with circles and 3 Dimensional triangles. Plane trigonometry uses different numbers and equations than spherical trigonometry. There's plane trigonometry, where you work with triangles on a flat surface, then there's spherical trigonometry, where you work with triangles on a sphere.
Some would argue that the most complicated Field is Trigonometry.
That's definitely not trigonometry. A trigonometry problem involves relations between angles and lengths. If the monthly payment is 600, it would seem that in 8 months (for example), you would simply have to multiply 8 x 600.
They don't. If they did then trigonometry would be virtually non-existent.