Question
Find the volume and surface area of a sphere whose radius is: $\big(\text{Take}\ \pi=\frac{22}{7}\big).$
4.2cm
4.2cm
✓
Answer
Radius of the sphere = 4.2cm Now, volume $=\frac{4}{3}\pi\text{r}^3$
$=\frac{4}{3}\times\frac{22}{7}\times4.2\times4.2\times4.2$
$=310.46\text{cm}^3$ $\therefore$ Surface area $=4\pi\text{r}^2$ $=4\times\frac{22}{7}\times4.2\times4.2$ $=221.76\text{cm}^2$Need a full question paper?
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