aria dreptunghiului A=Lxla) P=2(L+l)=32, L+l=16, L=16-lL=7l, 7l=16-l,8l=16, l=16/2=2cmL=7*2=14cmA=14*2=28[tex] cm^{2} [/tex]b)P=2(L+l)=72, L+l=36, L=36-lL=11l, 11l=36-l, 12l=36, l=36/12=3cmL=11*l=33cmA=33*3=99[tex] cm^{2} [/tex]c) P=2(L+l)=120cm, L+l=60, L=60-ll=3L/7, 7l=3L, L=7l/3, 60-l=7l/3, numitor comun 3, 180-3l=7l, 10l=180, l=180/10=18cm, L=60-l=60-18=42cmA=42*18=756[tex] cm^{2} [/tex]
