Question

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

Answer 1

$\frac{9}{2}\pi\:{cm}^{2}$ is your answer

$Area\:of\:semi\:circle=\frac{\pi\times{r}^{2}}{2}\\=\frac{\pi{3}^{2}}{2}\\=\frac{9}{2}\times\pi\:{cm}^{2}$

area of circle = πr²

area of semi circle = area of circle/2= πr²/2