Since the shape of the frame is a square we know that its area is given as:
[tex]A=l^2[/tex]
where l is the length of each side, plugging the value of the area into the equation and solving for l we have:
[tex]\begin{gathered} 123=l^2 \\ l=\sqrt[]{123} \\ l\approx11.09 \end{gathered}[/tex]
Therefore we notice that the length of the sides is between 11 and 12 inches, hence the answer is C.
