Question

What is the radius of sphere whose surface area is 154cm^2

Answer 1

Answer:

$\sf{r = 3.5cm}$

Step-by-step explanation:

$\sf{ \underline{Given}}:\sf{surface \: area \: of \: sphere = 154 {cm}^{2}}$

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

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

$\sf{{r}^{2}} = \sf{154 {cm}^{2}} \times \sf{ \frac{1}{4}} \times \sf{ \frac{7}{22}}$

$\sf{ {r}^{2} = \sf{12.25 {cm}^{2}}}$

$\sf{r = \sqrt12.25 {cm}^{2}}$

$\sf{r = 3.5cm}$

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