Find the circumference of the inner and the outer circles, shown in the adjoining figure.

It is given in the question that,

Radius of outer circle = 19 m

We know that,

Circumference of the circle = 2πr

= 2 × 3.14 × 19

= 38 × 3.14

= 119.32 m

Radius of inner circle = 19 – 10 = 9 m

As we know that,

Circumference of the circle = 2πr

= 2 × 3.14 × 9

= 18 × 3.14

= 56.52

Hence,

Circumference of outer circle = 119.32 m

Circumference of inner circle = 56.52 m