Question

Find the circumference of the semi circle 7cm

Answer 1

Given:

A semicircle with radius 7 cm.

To find:

The circumference of the given semi circle.

Solution:

We know that,

Circumference of a semi circle = Half of circumference of the circle + Diameter

`=(1)/(2)(2\pi r+d`

`=\pi r+2r`

Putting
`\pi=(22)/(7),r=7`, we get

Circumference of the semi circle
`=(22)/(7)(7)+2(7)`

`=22+14`

`=36`

Therefore, the circumference of the given semi circle 36 cm.