Let us consider a semicircle ABC

31.jpg

 

Perimeter of semicircle will be the distance around it

32.jpg

So,

  Perimeter of semicircle = ๐œ‹r + 2 r

 = r(๐œ‹ + 2)

Let us take an example:

 

 

Find perimeter of a semicircle with radius of  2 cm

33.jpg

Radius = r

    = 2 cm

 

Perimeter of semicircle = r (๐œ‹ + 2)

       = 2 (3.14 + 2)

       = 2 (314/100+2)

       = 2 ((314 +  2 × 100)/100)

       = 2 ((314 + 200)/100)

       = 2 (514/100)

       = 1028/100  = 10.28 cm

 

 

  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 9 years. He provides courses for Maths and Science at Teachoo.