Răspuns:
Explicație pas cu pas:
AB=8cm BC=9cm AE=36 cm AB=CD =8cm
AD=AB+BC+CD=8+9+8=25 cm
DE=AE-AD=36-25=11cm
BD=AD-AB=25-8=17 cm
BE=AE-AB=36-8=26 cm
BM=4,5cm
DN=DE/2=11/2=5,5 cm
MN=MC+CD+DN=3,5+8+5,5=9+8=17 cm
