a path 2 metre wide surrounds a circular pond of diameter 40m. how many cubic metres of Gravel are required to Grave the path to a Sept of 20cm.
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Answer:
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.Read more on Sarthaks.com - https://www.sarthaks.com/105869/path-wide-surrounds-circular-pond-diameter-4cm-how-many-cubic-meters-gravel-are-required
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Step-by-step explanation:
Area of circular pond with path(here r=42m)
=pai×r^2
=22×42×42/7
=22×6×42
=5544 sq m.
Area of circular pond(here r=40m)
=pai×r^2
=22×40×40/7
=5,028.57 sq m.
Area of path=5544-5028.57=515.43 sq m.
Let now consider that it is cylindrical in shape.
20cm=0.2m.
Gravel required=515.43×0.2=103.086 cu.m .
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