Let side of square =xcm Perimeter of square =4xcm 4x=72 ⇒x=18cm ∴ Side of square =18cm ∴ Breadth of rectangle =9cm Length of rectangle =9×3cm=27cm Perimeter of rectangle =2(l+b) =2 ( 27 + 9 ) = 2 × 36 = 72 cm Hence, the perimeter of both rectangle and square are equal.