Question
Find the volume of a sphere whose surface area is 154cm2. $\big(\text{Take}\ \pi=\frac{22}{7}\big).$
✓
Answer
Let the radius of the sphere be r cm.
Surface area of the sphere = 154cm2
$\therefore4\pi\text{r}^2=154$
$\Rightarrow4\times\frac{22}{7}\times\text{r}^2=154$
$\Rightarrow\text{r}=\sqrt{\frac{154\times7}{4\times22}}=\sqrt{1225}$
$\Rightarrow\text{r}=3.5\text{cm}$
$\therefore$ Volume of the sphere
$=\frac{4}{3}\pi\text{r}^3=\frac{4}{3}\times\frac{22}{7}\times(3.5)^3\approx179.67\text{m}^3$
Thus , the volume of the sphere is approximately 179.67m3.
Surface area of the sphere = 154cm2
$\therefore4\pi\text{r}^2=154$
$\Rightarrow4\times\frac{22}{7}\times\text{r}^2=154$
$\Rightarrow\text{r}=\sqrt{\frac{154\times7}{4\times22}}=\sqrt{1225}$
$\Rightarrow\text{r}=3.5\text{cm}$
$\therefore$ Volume of the sphere
$=\frac{4}{3}\pi\text{r}^3=\frac{4}{3}\times\frac{22}{7}\times(3.5)^3\approx179.67\text{m}^3$
Thus , the volume of the sphere is approximately 179.67m3.
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