Răspuns:
Explicație pas cu pas:
4 × Lp + 2 × ( Ld + ld ) = 1600
4 × Lp = Ld
ld = 2 × Lp
2 × ld + 2 × Ld + 2 × ld = 1600
4 × ld + 2 × Ld = 1600 | : 2
2 × ld + Ld = 800
4 × Lp + 4 × Lp = 800
8 × Lp = 800 ⇒ Lp = 800 : 8
Lp = 100 m ;
Pp = 4 × 100
Pp = 400 m ;
Pd = 2L + 2l
Pd = 2 × 400 + 2 × 200
Pd = 800 + 400
Pd = 1200 m.