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Definition: assigns a name to the ratio of the length of the sides of a right triangle.
Rules of trigonometry:
1. a + b = 90 (and) a + b + c = 180
2. A2 + B2 = C2 (Pythagorean Theorem)
3. sin(A) = b/c (and) cos(A) = a/c
4. sin(A) = cos(90 - A) and vice-versa
5. a = sin(A) * c (and) a = cos(B) * c
6. a/A and b/B may be reversed
7.
c/C is always the long side, 90° C
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