1.
P= 2*L+2*l=288
a)AB = 40
288-2*40=288-80=208
BC=208:2=104: L=104; l=40
b) AD= 3AB ; AD=L; AB=l
2*3AB+2AB= 288
8AB=288
AB=36
AD= 36*3=108
L=108
l=36
c) BC=80/100*AB=4/5*AB=2*AB/5
2*AB+2*4AB/5=288
10AB+8AB=288*5
18AB=288*5
AB=1440: 18=80
BC = 4/5*80= 16*4=64
L=80
l=64