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Mensuration related to circles

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imageA well of diameter 140 cm has a stone parapet around it. If the length of the outer edge of the parapet is 616cm, find the width of the parapet.


 

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Given that, a diameter is 140 cm and length of the outer edge is 616 cm.
Circumference of the circle = 2πr.

The width of the parapet,

The width of the parapet is 28cm.

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