\[\boxed{\ \mathbf{603\ (603)}.\ Еуроки\ - \ ДЗ\ без\ мороки}\]
\[a = 7\ см:\ \]
\[S_{пов} = 6a^{2} = 6 \cdot 7^{2} = 6 \cdot 49 =\]
\[= 294\ см^{2}.\]
\[l = 12a = 12 \cdot 7 = 84\ см.\]
\[Ответ:294\ см^{2},\ 84\ см.\]
\[\boxed{\mathbf{603}.\ }\]
\[1)\ 7,\ 14,\ 21,\ 28,\ 35;\]
\[2)\ 30,\ 60,\ 90,\ 120,\ 150;\]
\[3)\ 100,\ 200,\ 300,\ 400,\ 500;\]
\[4)\ 34,\ 68,\ 102,\ 136,\ 170.\]