Răspuns :
L=6l
6lx2+2xl=420
12l+2l=420
14l=420
l=420:14
l=30
L=30x6
L=180
P patratului ci l=30 ete
30x4=120m
6lx2+2xl=420
12l+2l=420
14l=420
l=420:14
l=30
L=30x6
L=180
P patratului ci l=30 ete
30x4=120m
P=2L+2l=420 =>L+l=210
l=L:6 =>L=6l
6l+l=210
7l=210 =>l=30m =>L=180m
Perim.patrat.=30+30+30+30=4x30=120m
l=L:6 =>L=6l
6l+l=210
7l=210 =>l=30m =>L=180m
Perim.patrat.=30+30+30+30=4x30=120m