Suppose we have a park like this

1.jpg

And I run along the boundary from point A & back to point A

This blue line is the perimeter of the figure

Perimeter is distance along the boundary of a closed figure

 

Let’s take some examples.

 

Find Perimeter

2.jpg

 

Perimeter = Sum of all sides

 = AB + BC + CD + AD

 = 40 + 10 + 40 + 10

 = 100 cm

 

Find Perimeter

3.jpg

 

Perimeter = Sum of all sides

         = AB + BC + CD + DA

 = 5 + 5 + 5 + 5

 = 20 cm

 

Find Perimeter

4.jpg

 

Perimeter = LA + AB + BC

         + CD + DE + EF

         + FG + GH + HI

                + IJ + JK + KL

= 3 + 1 + 3 + 3 + 1 + 3 + 3 + 1 + 3 + 3 + 1 + 3

= 7 + 7 + 7 + 7

= 28 cm

 

Find Perimeter

5.jpg

 

Perimeter = AB + BC + CD + DE + EF + FA

 = 100 + 120 + 90 + 45 + 60 + 80

 = 220 + 135 + 140

 = 355 + 140

 = 495 m

  1. Chapter 11 Class 7 Perimeter and Area
  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.