Let’s take a square

We know that

In a square, all sides are equal

AB = BC = CD = AD

Let AB = a

So,

AB = BC = CD = AD = a

Now,

Perimeter of square = Sum of all sides

= AB + BC + CD + AD

= a + a + a + a

= 4a

= 4 × Side of square

So,

Perimeter of square = 4a

= 4 × Side of square

Let’s solve some examples

####
**
Find perimeter of a square whose side is 15 cm
**

**
**

Given,

Side of square = a = 15 cm

So,

Perimeter of square = 4 × side of square

= 4a

= 4 × 15

= 60 cm

Thus, Perimeter of square is
**
60 cm
**

####
**
Find perimeter of a square whose side is 0.5 m
**

**
**

Given,

Side of square = a = 0.5 m

= 0.5 × 100 cm
*
(1m = 100 cm)
*

= 50 cm

So, Perimeter of square = 4 × Side of square

= 4a

= 4 × 50

**
= 200 cm
**

= 200/100 m
*
(1 cm =
*
1/100
*
m
*
*
)
*

= 2 m