The length of the arc is given by the next equation;
The diameter is 9ft
The angle is 180 degrees + 60 degrees = 240 degrees
[tex]s=\frac{θ}{360}\ast\pi d[/tex]
Replacing:
[tex]\begin{gathered} s=\frac{240}{360}\ast\pi(12ft) \\ s=8\pi ft \end{gathered}[/tex]
Hence, the length of the arc is 8pi ft.
