Răspuns :
P = 2 × (AB + BC) =54
AB + BC = 54 : 2 = 27
AB = 2 × BC
2 × BC + BC = 27
3 × BC = 27
BC = 9 cm
AB = 2 × 9 = 18 cm
AB + BC = 54 : 2 = 27
AB = 2 × BC
2 × BC + BC = 27
3 × BC = 27
BC = 9 cm
AB = 2 × 9 = 18 cm