se formeaza:ΔADM,ΔBNC si trapezul ABNM
AriaΔADM=AD×DM/2=600×50/2=15000m²
AriaBCN=NC×BC/2=250×600/2=75000m²
AtrapezuluiABNM=(AB+MN)/2×h
MN=DC-(DM+NC)=800-(50+250)=500m
h=AD=600m
⇒Atrapez=(800+500)/2×600=390000m²
deoarece 1ha=10000m²⇒AΔADM=1,5ha,AΔBCN=7,5ha,AtrapezABNM=39ha