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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An answer is impossible because there are no cubic units within a circle but only square units
803.84 is the volume in cubic ft when using 3.14 as pi.
What you have there isn't actually a circle, but a stubby pillbox of a "cylinder".Volume of a cylinder = (pi) (R2) (H) = (pi) (15.5)2 (2) = 1,509.54 cubic inches (rounded)
4 inches = 0.1016 metres. So volume = pi*r2*h = pi*(17/2)2*0.1016 = 23.1 cubic metres (approx)
The US one-cent coin is 0.750 inches in diameter and 0.061 inches thick,for a volume of 0.027 cubic inches.The UK plated-steel penny (one new pence) is 20.32 mm in diameter and 1.65 mm thick, for a volume of 0.535 cm3 or about 0.033 cubic inches.(see related question)