Dear student,

Perimeter of square =40 cm

Let the side be x

A.T.Q,

Perimeter of a square = 4 × sides

40 cm = 4x

4x = 40 cm

X = 40 / 4

X = 10 cm

So, area of the square,

Side × side m square = 10 × 10 cm

= 100 cm square

Area of square = Area of rectangle

100 cm square = 100 cm square

In the rectangle,

Length = 20 cm

Breadth = x

Area = 100 cm square

A. T. Q,

Length × breadth = Area

20 × X = 100

20 x = 100

X = 100 / 20

X = 5 cm

Tanmayee

regards