Question
The area of a circle is $1381m^2$. Find its circumference.
✓
Answer
Area of a circle $=1386\text{m}^2$
$\therefore\text{Radius (r)}=\sqrt{\frac{\text{Area}}{\pi}}=\sqrt{\frac{1386\times7}{22}}\text{m}$
$=\sqrt{441}=21\text{m}$
$\therefore\text{Circumference}=2\pi\text{r}=2\times\frac{22}{7}\times21\text{m}$
$=132\text{m}$
$\therefore\text{Radius (r)}=\sqrt{\frac{\text{Area}}{\pi}}=\sqrt{\frac{1386\times7}{22}}\text{m}$
$=\sqrt{441}=21\text{m}$
$\therefore\text{Circumference}=2\pi\text{r}=2\times\frac{22}{7}\times21\text{m}$
$=132\text{m}$
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