Question

B) the perimeter of the shape is 25.71cm

calculate the value of the radius x.
take pi to be 3.142

Answer 1

We have been given that the perimeter of a semicircle is 25.71 cm. We are asked to find the value of the radius.

We know that perimeter of a semicircle is
`\pi r+2r`, where r is radius of perimeter.

Upon equating perimeter of semicircle formula with 25.71, we will get:

`\pi r+2r=25.71`

`3.142r+2r=25.71`

`5.142r=25.71`

`(5.142r)/(5.142)=(25.71)/(5.142)`

`r=5`

Therefore, the radius of the semicircle is 5 cm.