3. P= 2L+2l
P=176m
L-8=l+8
L= l+8+8=l+16
Inlocuim
176m=2(l+16)+2l
176m=4l+32 rezulta ca l=36m deci
L= 36+16= 52m
4. Pd=Pp
Pd= 2L+2l
Pd=2*180cm+2*180:3
Pd=360+120=480cm
Rezulta Pp=480cm
Pp= 4L
Pp=480:4=120cm
5. Ptriunghi=AB+BC+AC
AB=28m
BC=28m-10m=18m
AC=28+28-10=46m
P=28+18+46=46+46=92
de aici mi se par putin cam complicate exercitiile..