if I understand right, the radius if 5.
pi*5^2
3.14159*25= 78.540 (rounded to 3 digets after decimal)
78.540*.333 (because 4 inches is 1/3 of a foot)
26.180
26.180 cubic feet
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An answers is impossible because there are no cubic units within a circle but only square units.
The volume of a cylinder with a radius of 2 inches by 4 feet high is: 0.349 cubic feet.
The volume is approximately 0.3315 cubic feet.
The volume is 36*68*31 = 75,888 cubic inches = 75,888 / (12*12*12) = 43.91667 cubic feet.
18" x 8" x 15" = 2,160 cubic inches = 1.25 cubic feet