Question

Work out the area of a semicircle with radius 3 cm.
Give your answer in terms of .
3 cm

Answer 1

9/2 pi

Explanation:

The formula for the area of a circle is
`\pi r^2`. Since a semicircle is just half of a circle, the formula for its area is
`(1)/(2)\pi r^2`. Plugging in 3 for r, we get:

`A= (1)/(2)\pi \cdot (3)^2 = (9)/(2)\pi`