Generally it means that the dimension is for reference only. The actual (real dimension) will show up somewhere else on a drawing. It could also be put on a dimension that you really don't want an inspector to hold tight (material thicknesses that vary with vendor or batch run)
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they show the magnitude
If there are parentheses around the numbers (two parentheses for each number) multiply them.
Square kilometers represent an area, you can't convert to a linear dimension.
parentheses two times nine parentheses times negative eight minutes four parentheses four plus hundred plus eight
removing the parentheses in a math problem