Let’s take a square

11.jpg

We know that

In a square, all sides are equal

  AB = BC = CD = AD

 

Let AB = a

So,

     AB = BC = CD = AD = a

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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

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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

14.jpg

 

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 10 Class 6 Mensuration
  2. Concept wise

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Davneet Singh
Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 8 years. He provides courses for Maths and Science at Teachoo. You can check his NCERT Solutions from Class 6 to 12.