Question

Find the volume of a sphere whose surface area is 154 cm².​

Answer 1

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$surface \: area \: of \: sphere \: = 4\frac{22}{7} {r}^{2} = 154c {m}^{2} \\ = > 4 \times \frac{22}{7} {r}^{2} = 154c {m}^{2} \\ = > {r}^{2} = \frac{154}{7} \times \frac{7}{22} \\ = > {r}^{2} = \frac{49}{4} \\ r = \frac{7}{2}$