Răspuns :

Răspuns:

Perimetrul=120m=2×a+2×b

a/b=2=> a=b*2 => 4b+2b=120

6b=120

b=20m

a=40m

P = 120 = 2L + 2l

L/l = 2 => L = 2l

120 = 2·2l + 2l

120 = 4l + 2l

120 = 6l

l = 120 : 6

l = 20 m

L = 40 m