18 inches is equivalent to 1 and a half feet. 12 inches equals 1 foot.
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18 feet 0.5 inches.
A cylinder that has an 18-inch diameter and is 36 inches long has a volume of: 5.3 cubic feet.
13.5 square feet.
6 feet 10 inches
There are 12 inches in one foot. Therefore, 18 feet is equal to 18 x 12 = 216 inches.