Well if what you are asking is whether you would use perimeter or area to measure a set amount of wallpaper the answer is area; e.g. 1 sq. ft. of wall paper
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Perimeter = 38 feet Area = 90 square feet
There is no relationship between the perimeter and area of a rectangle. Knowing the perimeter, it's not possible to find the area. If you pick a number for the perimeter, there are an infinite number of rectangles with different areas that all have that perimeter. Knowing the area, it's not possible to find the perimeter. If you pick a number for the area, there are an infinite number of rectangles with different perimeters that all have that area.
A square with an area of 400 square units has a perimeter of 80 units.
units square= area units= perimeter
When the area of a square is 36cm2, its perimeter is: 24 cm