Use Pythagoras Theory.
Like Mellie said
$${{\mathtt{a}}}^{{\mathtt{2}}}{\mathtt{\,\small\textbf+\,}}{{\mathtt{b}}}^{{\mathtt{2}}} = {{\mathtt{c}}}^{{\mathtt{2}}}$$
The hypotenuse is the longest side.
If you square the adjacent side and add it to the Opposite side squared you get the Hypotenuse squared.
Square root the answer to find the hypotenuse.