Question

Sudhanshu divides a circular disc of radius 7 cm into two equal parts. What is the perimeter of each semicircular piece? (show working too)

Answer 1

Given that radius (r) = 7 cm.

We know that the circumference of the circle =
`2\pi r`

So, the circumference of the semicircle =
`(1)/(2) *2\pi r=\pi r`

`=(22)/(7) *7 \ \text{cm}`

`=22 \ \text{cm}`

So, the diameter of the circle =
`2r=2*7 \ \text{cm}=14 \ \text{cm}`

Thus, the perimeter of each semicircular dis =
`22 \ \text{cm}+14 \ \text{cm}=36 \ \text{cm}`.