You multiply the width or length by the the height.
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Surface area = 2*(length*width + width+height + height*length) = 370.125 square units.
Double [ (length x width) + (length x height) + (width x height) ]
The area does not provide sufficient information to determine the length, width and height.
If you are multiplying length times width times height, that is three dimensions, and you will get a volume. Area is a two dimensional quantity. You would only need length times width to get area.
The area of a parallelogram is the length times the vertical height. In a rectangle, the vertical height is the same as the width so the area is length times width.