Answer:
» If given only opposite and adjacent.
[tex]{ \boxed{ \tt{hypotenuse = \sqrt{ {(opposite)}^{2} + {(adjacent)}^{2} } }}}[/tex]
» If give an angle, we use trigonometric ratios:
[tex]{ \tt{hypotenuse = \frac{opposite}{ \sin( \theta) } }} \\ \\ { \tt{hypotenuse = \frac{adjacent}{ \cos( \theta) } }}[/tex]