Remember that the formula for the circumference of a circle is:
[tex]C=\pi D[/tex]Solving for D (diameter), we get:
[tex]C=\pi D\rightarrow D=\frac{C}{\pi}[/tex]Using the data given, we'll get that:
[tex]D=\frac{177ft}{\pi}\Rightarrow D=56.34ft[/tex]Therefore, the diameter of the cirle is 56.34 feet