Question

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

Answer 1

Radius of outer circle$$(r)=19$$m
$$\therefore$$ Circumference of outer circle$$=2\pi r=2\times 3.14\times 19$$
$$=119.32$$m
Now radius of inner circle$$(r')=19-10=9$$m
$$\therefore$$ Circumference of inner circle$$=2\pi r'=2\times 3.14\times 9$$
$$=56.52$$m
Therefore the circumferences of inner and outer circles are $$56.52$$m and $$119.32$$m respectively.