If the perimeter is already measured in inches, there is nothing to convert. There are 18 inches in a perimeter of 18 inches.
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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.
If the area of the square is 324 square inches then its perimeter is 4*18 = 72 inches
Area of square: 324 square inches Perimeter of square: 72 inches
4.5*18 = 81 and 4.5+4.5+18+18 = a perimeter of 45 inches 3*27 = 81 and 3+3+27+27 = a perimeter of 60 inches
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.