Question

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

Answer 1

Answer:

$surface \: area \: = 4\pi {r}^{2} \\ \: \: \: \: \: \: 154 = 4 \times \frac{22}{7} \times {r}^{2} \\ \: \: \: \: \: \: \: \: {r}^{2} = 12.25 \\ \: \: \: \: \: \: \: r = \sqrt{12.25} \\ r = 3.5$

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