Because an area is in a two dimensional plane. Thus you express it in "squares" not straight lines of space taken up.
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36 square units. You can't express a perimeter in square units; a perimeter is a length expressed in ordinary units. If the perimeter of this square is 24 units then the answer above is correct.
no.. VOLUME is the amount of space occupied by a three-dimensional object or region of space, expressed in cubic units while area, measure of the size of a surface region, usually expressed in units that are the square of linear units, e.g., square feet or square meters.
Area is expressed in units of area - for example in square inches, but not in inches.
If the area of a square is 35 square units the perimeter is: 23.66 units.
The formula for the area of a circle is: Area = π x r2 (r is the radius and Pi is about 3.1416). The result is expressed in square units.