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limacharliesierra
If the lenght of a circle circumference is given by:
[tex]c = 2\pi \times r[/tex]

So the lenght of a semicircle circumference is given by the half of it:
[tex]c \: (semicircle) = (2\pi \times r) \div 2 \\ c \: (semicircle) =\pi \times r[/tex]

Radius (R) = 12 ft
[tex]c \: (semicircle) =12\pi \: ft[/tex]

Answer = 12pi ft of fence.

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