\[Страница\ 88.\]
\[\boxed{\mathbf{9}.}\]
\[S = 6 \cdot a^{2} = 150\]
\[a^{2} = 150\ :6 = 25\]
\[a = 5\ см.\]
\[Ответ:5\ см.\]
\[\boxed{\mathbf{10}.}\]
\[= 2 \cdot (150 + 100 + 600) =\]
\[= 2 \cdot 850 = 1700\ см^{2} = 17\ дм^{2}.\]
\[17 \cdot 3 = 51\ (г) - краски\ \]
\[израсходовали.\]
\[Ответ:51\ г.\]
\[\boxed{\mathbf{11}.}\]
\[\textbf{а)}\ S = 6 \cdot a^{2} = 6 \cdot 1^{2} = 6\ дм^{2}.\]
\[\textbf{б)}\ S = 6 \cdot a^{2} = 6 \cdot 1^{2} = 6\ м^{2}.\]