Question

If you have a semi-circle with a diameter of 8.6ft, what's the semi-circles area?

Use the formula $\pi r^{2}$

Answer 1

So,

The diameter is 8.6ft.  We need to convert to radius.

2 radius = 1 diameter

8.6/2 = 4.3 ft.

$\pi r{2}$

$\pi 4.3^{2}$

$\pi 18.49$

3.14(18.49)

58.0586ft.²

Divide by 2 (semi-circle)
29.0293ft.²