In pythagoras theorem, we have the formula:
[tex]\begin{gathered} c^2=a^2+b^2 \\ \\ c=\sqrt[]{a^2+b^2} \end{gathered}[/tex]The side c is the longest side in the triangle which is called the hypotenuse.
The letter c is not always on the left side.
If you are to find side a, use the formula:
[tex]\begin{gathered} a^2=c^2-b^2 \\ \\ a=\sqrt[]{c^2-b^2} \end{gathered}[/tex]Also, if we are to find side b, we have:
[tex]\begin{gathered} b^2=c^2-a^2 \\ \\ b=\sqrt[]{c^2-a^2} \end{gathered}[/tex]