It isn't. The area of a rectangle is length x width. What you are doing is counting how many square units will fit in the shape.
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the formula for a rectangle is L x W where L is length and W is width.
In order to find the area of a rectangle, you must follow the formula A= l x w where A is area, l is length, and w is width.
A = Area l = length w = width A = (l)(w) Ex: L = 5 in. W = 2 in. A = ? A = l(w) A = 5(2) A = 10 in2
MULTIPLICATION area for a rectangle is A = L * W * H where, A = area of rectangle L = Length of rectangle W = width of rectangle H = height of rectangle The dimensions of a rectangle (L, W, and H) are interchangeable because they are being multiplied together and hence each side of the rectangle can be arbitrarily assigned to a dimension.
The area of a rectangle equals its length times its width (A = l*w), so if you have the area divided by the one of the sides equals the other side (l = A/w; w = A/l )