\[\boxed{\mathbf{1022\ (1022)}\mathbf{.}\mathbf{\ }Еуроки\ - \ ДЗ\ без\ мороки}\]
\[\textbf{а)}\ \]
\[S = 5 \bullet 5 = 25\ (кв.\ ед).\]
\[\textbf{б)}\ \]
\[S = 3 \bullet 15 = 15\ (кв.\ ед.).\]