Răspuns :
P=2(L+l)=420
L+l=210
L=2,5l
2,5l+l=210
3,5l=210
l=60 m
L=2,5×60=150 m
L+l=210
L=2,5l
2,5l+l=210
3,5l=210
l=60 m
L=2,5×60=150 m
P=2(L+l)
L=2,5*l
420=2(2,5*l+ 1)
420=2*3,5 l
7l=420
l= 420: 7
l =60m
L=2,5*60
L=150m
L=2,5*l
420=2(2,5*l+ 1)
420=2*3,5 l
7l=420
l= 420: 7
l =60m
L=2,5*60
L=150m