\[\boxed{\mathbf{778\ (778)}\mathbf{.}\mathbf{\ }Еуроки\ - \ ДЗ\ без\ мороки}\]
\[\textbf{а)}\ BM = KO = AN = 4,5\ см.\]
\[BK = MO = CL = 2,5\ см.\]
\[P_{\text{KBMO}} = 2 \bullet (BM + MO) = 2 \bullet (4,5 + 2,5) = 2 \bullet 7 = 14\ см.\]
\[\textbf{б)}\ AK = CL = 2,5\ см.\]
\[KL = 2 \bullet AN = 2 \bullet 4,5 = 9\ см.\]
\[P_{\text{AKLD}} = 2 \bullet (AK + KL) = 2 \bullet (2,5 + 9) = 2 \bullet 11,5 = 23\ см.\]
\[\textbf{в)}\ AD = KL = 9\ см.\]
\[AB = 2 \bullet CL = 2 \bullet 2,5 = 5\ см.\]
\[P_{\text{ABCD}} = 2 \bullet (AD + AB) = 2 \bullet (9 + 5) = 2 \bullet 14 = 28\ см.\ \]
\[\textbf{г)}\ AN = MC = 4,5\ см.\]
\[NM = CD = AB = 5\ см.\]
\[ANMCD = AN + NM + MC + CD = 4,5 + 5 + 4,5 + 5 = 19\ см.\]
\[Ответ:а)\ 14\ см;\ \ б)\ 23\ см;\ \ в)\ 28\ см;\ \ г)\ 19\ см.\]