Perimeter of Semicircle

Let us consider a semicircle ABC

Perimeter of semicircle will be the distance around it

So,

  Perimeter of semicircle = 𝜋r + 2 r

 = r(𝜋 + 2)

Let us take an example:

Find perimeter of a semicircle with radius of  2 cm

Radius = r

    = 2 cm

Perimeter of semicircle = r (𝜋 + 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