Respuesta :

Answer:

Step-by-step explanation:

Length of the wire = 54 cm

12 + (AB + 9) + 9 + 12 + AB = 54

Add the like terms

12+ 9 + 9 + 12  + AB + AB = 54

42 + 2AB = 54

      2AB = 54 - 42

      2AB = 12

        AB = 12/2

AB = 6 cm