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 15 cm 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

1. Chapter 11 Class 7 Perimeter and Area
2. Concept wise
3. Square and Rectangle

Square and Rectangle

About the Author Davneet Singh
Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 9 years. He provides courses for Maths and Science at Teachoo.