18 inches = 45.72 centimetres.
18 inches = 45.72 centimetres.
18 inches = 45.72 centimetres.
18 inches = 45.72 centimetres.
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18 inches.
There are 12 inches in one foot, so 18 feet is equal to 18 x 12 inches, which is 216 inches.
18 inches of mercury
L x W x H = volume. So 18 x 5 x 6 = 540 square inches.