Question

Here is a semi circle of radius x the perimeter of the shape is the shape of 25.71cm calculate the value of the radius x

Answer 1

5 cm

Explanation:

Perimeter of a semicircle is :

P = πr + 2r

P = r(π + 2)

25.71 = r(3.14 + 2)

25.71 = r(5.14)

Divide both sides by 5.14

25.71 / 5.14 = r(5.14) / 5.14

5.0019455 = r

Hence, radius of semicircle = 5 cm