Răspuns :
P patrat=4 l
120=4 l
l=120:4=30 m
l dreptunghi=30 m
L=2 l=2×30=60 m
P dreptunghi=2(L+ l)
P=2(60+30)
P=2×90=180 m
120=4 l
l=120:4=30 m
l dreptunghi=30 m
L=2 l=2×30=60 m
P dreptunghi=2(L+ l)
P=2(60+30)
P=2×90=180 m