Question

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

a=10
b=19

Answer 1

Answer:

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

′

=2×3.14×9

=56.52m

Therefore the circumferences of inner and outer circles are 56.52m and 119.32m respectively.