Note that the area of a square is the square of its side.
[tex]A=s^2[/tex]If the area is 12 square inches, the side is approximately :
[tex]\begin{gathered} 12=s^2 \\ s=\sqrt[]{12} \\ s=3.46 \end{gathered}[/tex]And the area will be :
[tex]\begin{gathered} A=3.46^2 \\ A=11.9716 \end{gathered}[/tex]The answers are :
3.46 inches
and
11.9716 square inches