Volume of ball

Find the volume of a volleyball that has a radius of 4 1/2 decimeters. Use 22/7 for π

Correct answer:

V =  381.8571 dm³

Step-by-step explanation:

$$\begin{gathered} r=4+{\displaystyle \frac{1}{2}}={\displaystyle \frac{9}{2}}=4.5\text{ dm } \\ V={\displaystyle \frac{4}{3}}\pi r^3 \\ V={\displaystyle \frac{4}{3}}\cdot {\displaystyle \frac{22}{7}}\cdot r^3={\displaystyle \frac{4}{3}}\cdot {\displaystyle \frac{22}{7}}\cdot 4.5^3={\displaystyle \frac{2673}{7}}{\text{dm}}^3=381.8571{\text{dm}}^3 \end{gathered}$$

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