Răspuns :
Răspuns:
Pdreptunghi=2(L+l)
l/3=L/4=k→ coeficient de proportionalitate
l=3k
L=4k
56=2(4k+3k)
56=2·7k
56=14k=>k=56:14=>k=4
l=3·4=12m
L=4·4=16m
verificare:
P=2(12+16)
P=2·28
P=56 cm
Răspuns:
Pdreptunghi=2(L+l)
l 3=L/4=k ( coeficient de proportionalitate)
l=3k
L=4k
56=2(4k+3k)
56=2•7k
56=14k=>k=56:14=>k=4
l=3•4=12
L=4•4=16 cm