Question

Find the area of the semi circle. Either enter an exact answer in terms of pie or use 3.14 for pi and enter your answer as a decimal.

Answer 1

SOLUTION:

The area of a semicircle is half that of a circle, it is given by the formula;

$\frac{\pi r^2}{2}$

Here, d = 10 and therefore r = 5. The area is;

$A=\frac{\pi\times5^2}{2}=\frac{25\pi}{2}=12.5\pi$

Therefore, the area is;

$\begin{gathered} 12.5\pi\text{ }units^2 \\ \\ or \\ \\ 39.25\text{ }units^2\text{ } \end{gathered}$