Question
Find the circumference of a circle whose radius is: $4\ km.$
✓
Answer
We know that the circumference of a circle of radius $r$ is given by $C =2\pi\text{r}$
Here, $r = 4\ km$
$\Rightarrow\text{C}=2\times\frac{22}{7}\times4=25.142\text{km}$
Here, $r = 4\ km$
$\Rightarrow\text{C}=2\times\frac{22}{7}\times4=25.142\text{km}$
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