Let A and B be the length of the legs of a right triangle, and C be the hypotenuse.
Then, from the Pythagorean Theorem:
[tex]C^2=A^2+B^2[/tex]If the missing side is the hypotenuse C, then we can isolate it as:
[tex]C=\sqrt[]{A^2+B^2}[/tex]If the missing side is one leg, we can substract the length of the other leg from both sides and take the square root, so:
[tex]\begin{gathered} A=\sqrt[]{C^2-B^2} \\ B=\sqrt[]{C^2-A^2} \end{gathered}[/tex]
