Răspuns :
L=2.8 l=latime L=lungime
P unui dreptunghi =2L+2l=92cm
2L=2.8 x 2=5.6dm=56cm
92cm-56cm=36cm(2l)
a)36cm:2=18 cm=1 latime=1.8dm
Aria unui dreptunghi=L x l=2.8dm x 1.8dm=5.04dm
P=2(L+l)
P=92cm
L=2.8dm=28cm
2*28+2l=92
2l=92-56 l=18cm
b) ARIA=L*l
A=28*18=504 cm
P=92cm
L=2.8dm=28cm
2*28+2l=92
2l=92-56 l=18cm
b) ARIA=L*l
A=28*18=504 cm