Question

A fence is ito be nstalled around a semicircle

With a radius of 12 feet. How much fence is needed?

Answer 1

If the lenght of a circle circumference is given by:

`c = 2\pi * r`

So the lenght of a semicircle circumference is given by the half of it:

`c \: (semicircle) = (2\pi * r) / 2 \\ c \: (semicircle) =\pi * r`

Radius (R) = 12 ft

`c \: (semicircle) =12\pi \: ft`

Answer = 12pi ft of fence.