Given,
Length of rectangle = 9 cm and
Breadth of rectangle = 4 cm
We know,
Area of rectangle = length×breadth
= 9 x 4
= 36 cm2
Also, area of square = side2
According to the given condition,
side2=length × breadth⇒side2=36⇒side=√36∴side=6 cm
Perimeter of a square = 4×side
= 4×6
= 24 cm
Therefore, perimeter of the square is 24 cm.