Let the breadth of the rectangle be xcm. and Length of the rectangle =4xcm Given, perimeter of rectangle =50 According to the question, Area of square = Area of rectangle =100cm2 a2=100 [∵ Let the each side of square be acm] a=√100 ⇒a=10cm ∴ Perimeter of the square =4×a=4×10 =40cm