\[\boxed{\mathbf{449.ОК\ ГДЗ - домашка\ на}\ 5}\]
\[Площадь\ квадрата\ равна\ \]
\[произведению\ его\ сторон:\]
\[S = a^{2}.\]
\[\textbf{а)}\ a = 1,2\ см:\ \]
\[S = (1,2)^{2} = 1,44\ см^{2}.\]
\[\textbf{б)}\ a = \frac{3}{4}\ дм:\]
\[S = \left( \frac{3}{4} \right)^{2} = \frac{9}{16}\ дм^{2}.\]
\[\textbf{в)}\ a = 3\sqrt{2}\ м:\]
\[S = \left( 3\sqrt{2} \right)^{2} = 9 \bullet 2 = 18\ м^{2}.\]