The answer depends on which of the two measures is the height and which is the radius or diameter. Since you have not bothered to share those crucial bits of information, I cannot provide a more useful answer.
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Assuming it is a rectangle, 8.485 US gallons
2240 Imperial fl oz = 14 Imperial gallons.
Just over 20 gallons
A circle with a 14 inch diameter has an area of 153.9 sq inches.
Its perimeter: 12+14+12+14 = 52 inches