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18 inches = 45.72 centimetres.18 inches = 45.72 centimetres.18 inches = 45.72 centimetres.18 inches = 45.72 centimetres.
If the perimeter is already measured in inches, there is nothing to convert. There are 18 inches in a perimeter of 18 inches.
18 x 18 x 36 = 11,664 cubic inches
1 yard = 36 inches 3 yards = 3*36 = 108 inches 3 yards 18 inches = 108+18 inches = 126 inches
There are 12 inches in one foot. Therefore, 18 feet is equal to 18 x 12 = 216 inches.