Trigonometry of a Right Triangle
University of Louisville Physics and Astronomy Module Project
MIT License Copyright (c) 2017 John Kielkopf and Aaron Hill
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Explanation

C is the hypotenuse, A is the vertical side, B is the horizontal side, and θ is the angle from B to C.

C = √(A2 + B2).

tan(θ) = A/B
sin(θ) = B/C
cos(θ) = A/C