The answer is 45.72 centimeters. One inch is equal to 2.54 centimeters. To convert inches into centimeters, multiply the inches by 2.54.
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If the perimeter is already measured in inches, there is nothing to convert. There are 18 inches in a perimeter of 18 inches.
If the octagon is not regular, the perimeter could have any value greater than 18 inches. If it is regular, then the perimeter is 8*18 = 144 inches.
18 inches = 45.72 centimeters
The length is (18 centimeters) minus (the width)
If the area of the square is 324 square inches then its perimeter is 4*18 = 72 inches