Find the circumference of the inner and the outer circles, shown in the adjoining figure ? (Take `pi=3.14`)

Explanation

Radius of outer circle(r)=19m

∴ Circumference of outer circle=`2πr=2×3.14×19`

=`119.32m`

Now radius of inner circle`(r
′
)=19−10=9m`

∴ Circumference of inner circle=2πr
′
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