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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) = 20m

Thickness = 2m 

Depth = 20 cm = 0.2m

Since it is viewed as a hollow cylinder

Therefore, 52.8 m3 of gravel is required to have path to a depth of 20cm.

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