A wire with a length of 54 cm is bent to form a shape as shown in the diagram. what is the length of side AB

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