The radius of two circles are 20 ~cm and 13 ~cm. Find the differe… - Vidyadip

Question

The radius of two circles are $20 \mathrm{~cm}$ and $13 \mathrm{~cm}$. Find the difference between their circumferences. (Take $\left.\pi=\frac{22}{7}\right)$

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Answer

Radius of $1^{\text {st }}$ circle $=20 \mathrm{~cm}$
Circumference of the circle $=2 \pi r$
$ \begin{aligned} & =2 \times \frac{22}{7} \times 20 \\ & =40 \times \frac{22}{7} \\ & =125.7 \mathrm{~cm} \end{aligned} $
The radius of $2^{\text {nd }}$ circle $=13 \mathrm{~cm}$
Circumference of the circle $=2 \pi \mathrm{r}$
$ \begin{aligned} & =2 \times \frac{22}{7} \times 13 \\ & =26 \times \frac{22}{7} \\ & =81.7 \end{aligned} $
$\therefore$ The difference of circumference of two circles
$ =125.7-81.7 \mathrm{~cm}=44 \mathrm{~cm} $

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