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 = $19$ $m$
Circumference = $2\pi r$
= $2 \times 3.14 \times 19$
= $119.32$ $m$
Radius of inner circle = $19 - 10 = 9$ $m$
Circumference = $2\pi r$
= $2 \times 3.14 \times 9$
= $56.52$ $m$