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Volume = pi * r2 * h

= pi * (21/6)2 * (6/36)

since 21 foot diameter = 21/2 foot radius = 21/6 yard radius

and 6 inches = 6/36 yards

so volume = 6.414 cu yards.

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Q: How many cubic yards in an 21 foot diameter circle 6 inches thick with sand?
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