Let's begin by listing out the given information:
[tex]\begin{gathered} a=2in,b=2in,c=\text{?} \\ \text{Pythagora}s\text{ Theorem states that:} \\ c^2=a^2+b^2 \\ c^2=2^2+2^2 \\ c^2=4+4=8 \\ c=\sqrt[]{8}=2\sqrt[]{2} \\ c=2\sqrt[]{2}in \end{gathered}[/tex]