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    Lightbulb geometry homework

    how many cubic inches of material are needed for a solid rubber ball with a diameter of 3 inches?
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    Quote Originally Posted by hamadouousmane View Post
    how many cubic inches of material are needed for a solid rubber ball with a diameter of 3 inches?
    The volume of a sphere is

    V=\frac{4}{3} \pi r^3


    D=2r

    so r=\frac{3}{2}in

    V==\frac{4}{3} \pi \left( \frac{3}{2}in  \right)^3=\frac{4 \pi}{3}\frac{27}{8}in^3 =\frac{9\pi}{2} in^3
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