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Write all six trigonometric ratios.
A right triangle always includes a 90° (?/2 radians) angle, here labeled C. Angles A and B may vary. Trigonometric functions specify the relationships among side lengths and interior angles of a right triangle.
\sin A = \frac {\textrm{opposite}} {\textrm{hypotenuse}} = \frac {a} {h}.     CosecA = 1/SinA
\cos A = \frac {\textrm{adjacent}} {\textrm{hypotenuse}} = \frac {b} {h}.   SecA = 1/CosA

\tan A = \frac {\textrm{opposite}} {\textrm{adjacent}} = \frac {a} {b}.Cot A = 1/TanA


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