Let’s take a rectangle

We know that

In a rectangle, opposite sides are equal

AB = CD

& AD = BC

Let

AB = Length of rectangle =
*
l
*

BC = Breadth of rectangle = b

So,

AB = CD =
*
l
*

BC = AD = b

Now,

Perimeter of rectangle = Sum of all sides

= AB + BC + CD + DA

=
*
l
*
+ b +
*
l
*
+ b

= 2
*
l
*
+ 2b

= 2 (
*
l
*
+ b)

So,

Perimeter of rectangle = 2 (
*
l
*
+ b)

Let’s take some examples

####
**
Find perimeter of rectangle where length is 15cm & breadth is 9 cm
**

**
**

Given,

Length =
*
l
*
= 15 cm

Breadth = b = 9 cm

Perimeter of rectangle = 2 × (Length + Breadth)

= 2 × (15 + 9)

= 2 × 24

= 48 cm

So, perimeter of rectangle is 48 cm

####
**
Find perimeter of rectangle where length & breadth are 0.5 m & 0.2 m respectively.
**

Given,

Length =
*
l
*
= 0.5 cm

Breadth = b = 0.2 cm

Perimeter of rectangle = 2 × (Length + Breadth)

= 2 × (0.5 + 0.2)

= (2 × 0.7)

= 1.4 m

= 1.4 × 100 cm
*
(1m = 100 cm)
*

= 140 cm