First of all, there is no reason to suppose that the area is rectangular as opposed to circular or triangular or some other simple or complicated shape. Even if, on the basis that the question asks for length and width, you assume that it is a rectangle, there are infinitely many possible answers: ranging from a nearly square area to an extremely long, very thin strip: for example 18 kilometres long and 1 millimetre wide.
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That's wrong; 18 inch is not a unit of area. In general, since in a square the length and width are the same, you take the square root of the area, to get the length of a side.
There's no way to know. There are an infinite number of length/width combinations that all have the same area, and just knowing the area doesn't tell you which one it is.
28*18 = 504 square units
324 square feet. Multiply length by width - the result is the area in square feet.
Length: 4; Width: 5 or Length: 5; Width: 4