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20 x 18 = 360 square inches
It is about 18 inches
0.7087 in.
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.