Question

B) the perimeter of the shape is 25.71cm

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:

$\pi r+2r=25.71$

$3.142r+2r=25.71$

$5.142r=25.71$

$\frac{5.142r}{5.142}=\frac{25.71}{5.142}$

$r=5$

Therefore, the radius of the semicircle is 5 cm.