Question

If the surface area of sphere is 154 cm2 then its radius in cms

Answer 1

$surface \: area \: of \: sphere \: = 4\pi \: r {}^{2} \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: 4\pi \: r {}^{2} = 154 \\ \: \: \: \: \: \: \: \: 4 \times 3.14 \times r {}^{2} = 154 \\ \: \: \: \: \: \: r = \frac{7}{2} = 3.5cm \\ \\ hope \: it \: helps \: \\ \\ follow \: me \\ mark \: me \: as \: brainiest$

Answer 2

Given,

Surface area of Sphere = 154 cm^2

Now,

Surface area of Sphere = 154 cm^2

$= > 4 \pi \: {r}^{2} = 154 \: {cm}^{2}$

$= > 4 \times \frac{22}{7} \times {r}^{2} = 154$

$= > \frac{88}{ 7} \times {r}^{2} = 154$

$= > {r}^{2} \: \: = \frac{154 \times 7}{88}$

$= > {r}^{2} \: = \frac{1078}{88}$

$= > {r}^{2} \: = 12.25 \: {cm}^{2}$

$= > \: r \: \: = \sqrt{12.25}$

$= > \: r \: \: = 3.5 \: cm \:$


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