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A path 2m wide surrounds a circular pond of diameter 4cm. how many cubic meters of gravel are required to

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A path 2m wide surrounds a circular pond of diameter 4cm. how many cubic meters of gravel are required to grave the path to a depth of 20cm.

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Diameter of circular pond = 40 m

Radius of pond(r) = 20 m 

Thickness = 2m 

Depth = 20 cm = 0.2 m

Since it is viewed as a hollow cylinder

52.77 m3 of gravel is required to have path to a depth of 20 cm.

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