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Answer :
i)Given :
Radius of sphere = \(\frac{28}{2} cm = 14 cm\)
We know that,
Volume of sphere
= \(\frac{4}{3}{\pi}{r}^3\)
= \(\frac{4}{3} × \frac{22}{7} × {14}^3\) \({cm}^3\)
= \(11498\frac{2}{3}\) \({cm}^3\)
Therefore, the volume of the sphere is \(11498\frac{2}{3}\) \({cm}^3\).
ii)Given :
Radius of sphere = \(\frac{0.21}{2} m = 0.105 m\)
We know that,
Volume of sphere
= \(\frac{4}{3}{\pi}{r}^3\)
= \(\frac{4}{3} × \frac{22}{7} × {0.105}^3\) \({m}^3\)
= \(0.004851\) \({m}^3\)
Therefore, the volume of the sphere is \(0.004851\) \({m}^3\).