Question : The volume of a sphere of radius 4.2 cm is: (Use $\pi=\frac{22}{7}$)
Option 1: 278.234 cm3
Option 2: 312.725 cm3
Option 3: 297.824 cm3
Option 4: 310.464 cm3
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Correct Answer: 310.464 cm 3
Solution :
The volume $V$ of a sphere with radius $r$ is
$V = \frac{4}{3} \pi r^3$
Putting $r = 4.2 \, \text{cm}$ and $\pi = \frac{22}{7}$.
$V = \frac{4}{3} \times \frac{22}{7} \times (4.2)^3=310.464 \, \text{cm}^3$
Hence, the correct answer is 310.464 cm
3
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