Question

The perimeter of a shape is 25.71 cm calculate the value of the radius X takes pie to be 3.142

Answer 1

5 cm

Explanation:

Given a semicircle with perimeter 25.71 cm, we are required to find the radius of the circle.

Circumference of a Semicircle

=Length of the Circular part+Length of the diameter

`=\pi r+2r`

`If \: \pi=3.142, C=25.71\\Then:\\25.71=3.142r+2r\\r(3.142+2)=25.71\\5.142r=25.71\\r=25.71 /5.142\\r=5cm`