# Q. 15.     Find the circumference of the inner and the outer circles, shown in the adjoining figure? (Take $\pi =3.14$)

G Gautam harsolia

We know that

Circumference of circle = $2 \pi r$

Now, the circumference of the inner circle  with radius (r) = $19-10=9 \ m$ is

$\Rightarrow 2 \pi r = 2 \times 3.14 \times 9 = 56.52 \ m$

And the circumference of the outer circle  with radius (r ') = 19 m is

$\Rightarrow 2 \pi r = 2 \times 3.14 \times 19 = 119.32 \ m$

Therefore, the circumference of inner and outer circles are $56.52 \ m \ and \ 119.32 \ m$  respectively

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