\[P = 2(a + b) = 72;\]
\[a + b = 36\]
\[b = 36 - a.\]
\[S_{2} = (a + 1)(b + 2) = ab + 40.\]
\[(a + 1)(b + 2) = ab + 40\]
\[ab + b + 2a + 2 = ab + 40\]
\[b + 2a = 38\]
\[b = 38 - 2a.\]
\[36 - a = 38 - 2a\]
\[a = 2\ (м).\]
\[b = 36 - a = 36 - 2 = 34\ (м).\]
\[Ответ:2\ м\ и\ 34\ м.\]