Find the circumference of the inner and the outer circles, shown in the adjoining figure?
a=10
b=19
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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.
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