The perimeter of a shape such as a polygon is the sum of its sides.
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You add all the distances of the perimiter
You multiply the length times the width of the shape. LxW=A
In order to walk the perimeter of a square, an ant has to walk the length of a side four times. Consequently, in order to calculate the perimeter of a square, you must count the length of any side four times.
Twice (length + width)
the area is 18