Question

Find the perimeter of this semi-circle with diameter, d = 48cm.

Give your answer as an expression in terms of .
d cm​

Answer 1

Given :

Diameter of the semi-circle is, d = 48 cm.

To Find :

The perimeter of this semi-circle.

Solution :

We know, perimeter of semi-circle is given by :

P = πr

We know, r = D/2

r = 48/2 cm

r = 24 cm

Putting value of r in equation 1) we get :

P = π × 24 cm

P = 75.4 cm

Hence, this is the required solution.

Answer 2

P = 75.40 cm

Explanation:

Given that,

The diameter of the semicircle, d = 48 cm

Radius, r = 24 cm

The perimeter of the semicircle is given by :

`P=\frac{\text{The perimeter of the circle}}{2}\\\\=(2\pi r)/(2)\\\\=\pi r\\\\=3.142* 24\\\\=75.40\ cm`

So, the perimeter of the semicircle is 75.40 cm.