if it has a diameter of 3 inches, its radius is half that, or 1.5 inches.
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![\textit{Volume of a Sphere}\\\\ V=\cfrac{4\pi r^3}{3}~~ \begin{cases} r=radius\\[-0.5em] \hrulefill\\ r=1.5 \end{cases}\implies V=\cfrac{4\pi (1.5)^2}{3}](https://img.qammunity.org/2024/formulas/mathematics/high-school/jhepavsmz4bqnl61iu4lo0kru475qkleqs.png)