Question

Work out the area of a semi circle with a radius of 3cm give your answer in terms of pi

Answer 1

The area of semicircle is $4.5 \pi\ cm^2$

Solution:

Given that,

We have to find the area of a semi circle with a radius of 3 cm

The area of semicircle is given as:

$Area\ of\ semicircle = \frac{ \pi r^2}{2}$

Where, r is the radius

From given,

r = 3 cm

Substituting the values we get,

$Area\ of\ semicircle = \frac{ \pi \times 3^2}{2}\\\\Area\ of\ semicircle = \frac{ \pi \times 9}{2}\\\\Area\ of\ semicircle = 4.5 \pi$

Thus the area of semicircle is $4.5 \pi\ cm^2$