21 feet = 21*12 inches = 252 inches - whether in a straight line or a circle or whatever.
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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.
A circle with a radius of 21 inches has a circumference of 131.95 inches.
one foot and nine inches = 21 inches
21 inches
There are 12 inches per foot. Therefore, (10-1/2)/12 = (21/2)/12 = 21/24 = 7/8 foot.