42cm
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A rectangle that is 2cm by 4cm has an area of 8cm. It also has a perimeter of 12cm.
26cm
perimeter = 8+8+5+5 = 26cm
Width of rectangle: 144/18 = 8cm Perimeter of rectangle: 2*(18+8) = 52cm
Perimeter = 20+8+20+8 = 56 cm.....