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Area of a Circle

The radii of ...

Question

The radii of the inner and outer circumferences of a circular running track are 63 m and 70 m respectively. Find the difference between the lengths of the two circumferences of the track

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Solution

Difference= 2 $π$ ( $r_{2} - r_{1}$ )
= 2 $π$ ( $70 - 63$ )
= 44 m

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