Use the three forms below:

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. A^{2} + B^{2} = C^{2} (Pythagorean Theorem)
3. sin(A) = b/c (and) cos(A) = a/c
4. sin(A) = cos(90  A) and viceversa
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
