9cm + 5cm + 9cm + 5cm = 28cm
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28 cm
20
An arbitrary large number is the answer for anyrectangle, up to that with a length of 9cm, and 0cm as the width will have a perimeter of 18cm.Similarly, any rectangle up to that with sides 0cm long, and a width of 9cm will have your 18cm perimeter.
11cm
Perimeter = 5*5 = 25 cm