Question
Find the volume and surface area of a sphere whose radius is: $\big(\text{Take}\ \pi=\frac{22}{7}\big).$
3.5cm
3.5cm
✓
Answer
Radius of the sphere = 3.5cm
Now, volume $=\frac{4}{3}\pi\text{r}^3$
$=\frac{4}{3}\times\frac{22}{7}\times3.5\times3.5\times3.5$
$=179.67\text{cm}^3$
$\therefore$ Surface area $=4\pi\text{r}^2$
$=4\times\frac{22}{7}\times3.5\times3.5$
$=154\text{cm}^2$
Now, volume $=\frac{4}{3}\pi\text{r}^3$
$=\frac{4}{3}\times\frac{22}{7}\times3.5\times3.5\times3.5$
$=179.67\text{cm}^3$
$\therefore$ Surface area $=4\pi\text{r}^2$
$=4\times\frac{22}{7}\times3.5\times3.5$
$=154\text{cm}^2$
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