Q15 of 43 Page 223

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


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