a) p=2L+2l
ab=l=40
p=288
----------
2L+2*40=288
L+40=144
L=144-40
L=104
b)ab=L
bc=l
------
L+8=l
p=2L+2l=288 rezulta din ultimele doua
2L+2(L+8)=288
L+L+8=144
2L=144-8
2L=136
L=136/2
L=68
l=L+8=68+8=76
c)ad=L
ab=l
---------
L-3=l
p=2L+2l=288
----------
2(L-3)+2L=288
L-3+2L=144
3L=144+3
3L=147
L=147/3
L=49
l=L-3=49-3=46
d)bc=L
ac=l
------
L=80%xl
p=2l+2L=288
------------------
2l+2(80%xl)=288
2l+2lx80/100=288
2l+160l/100=288
200l+160l=28800
360l=28800
l=80
L=80%x80=6400/100=64