According to the given graph, the diameter is 16 feet long, which means the radius is 8 feet.
Let's find the volume of the sphere using the proper formula
[tex]\begin{gathered} V=\frac{4}{3}\cdot\pi\cdot r^3 \\ V=\frac{4}{3}\cdot3.14\cdot(8ft)^3 \\ V\approx2,143.57ft^3 \end{gathered}[/tex]