\[KX = 38 - 2 = 36\ дм.\]
\[OK = 38 + 18 = 56\ дм.\]
\[P = 38 + 36 + 56 = 74 + 56 = 130\ дм.\]
\[130\ дм = 13\ м.\]
\[Ответ:13\ м.\]