If 40 is the measure of one side, the perimeter is 160.
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The perimeter is 40 inches.
A square with a perimeter of 40 inches has sides 10 inches long which will give it an area of 100 inches2
(40/4)2 = 102 = 100m2.
40 meters.
The smallest is just over 40 units. At 40 units it is no longer a rectangle but a square. There is no largest perimeter.