The correct option is
A 8.16 cm
We know,
Area of rectangle = Length
× Width
Let us find out the area of Rectangle 1.
Length = 7.2 cm
Width = 3.4 cm
∴ Area of Rectangle 1 = (7.2
× 3.4) sq cm
![](https://df0b18phdhzpx.cloudfront.net/ckeditor_assets/pictures/1223065/original_Screenshot_2021-07-05_172010.png)
Calculating 7.2
× 3.4 by standard algorithm, we get:
![](https://df0b18phdhzpx.cloudfront.net/ckeditor_assets/pictures/1223069/original_Screenshot_2021-07-05_172234.png)
Area of Rectangle 1 = 24.48 sq cm
It is given that,
Area of Rectangle 1 = Area of Rectangle 2
So, in Rectangle 2,
Area = 24.48 sq cm
Width = 3 cm
![](https://df0b18phdhzpx.cloudfront.net/ckeditor_assets/pictures/1223288/original_Screenshot_2021-07-05_183957.png)
The length of the rectangle can be observed as:
![](https://df0b18phdhzpx.cloudfront.net/ckeditor_assets/pictures/1211273/original_Screenshot_2021-06-29_182953.png)
∴ Length of the rectangle
= (24.48
÷ 3) cm
Let us divide the numbers using standard algorithm.
![](https://df0b18phdhzpx.cloudfront.net/ckeditor_assets/pictures/1223110/original_Screenshot_2021-07-05_173523.png)
So, length of Rectangle 2 is 8.16 cm.