20 x 18 = 360 square inches
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It is about 18 inches
0.7087 in.
6-ft x 18-in x 20-in = 72 x 18 x 20 = 25,920 cubic inches = 112.208 gallons of space,regardless of what's in it. Even if it's empty.
7.87 inches
18 inches = 1.5 feet, so 18 inches : 10 feet = 1.5 feet : 10 feet = 3 : 20