Răspuns:
AN=20:2=10cm
AM=20:2=10cm
MANO=10x10=100[tex]cm^{2}[/tex]
NB=20:2=10cm
NO=20:2=10cm
NOB=100:2=50[tex]cm^{2}[/tex]
[tex]A_{ABOM}[/tex]=100+50=150[tex]cm^{2}[/tex]
Explicație pas cu pas: