If you want the surface of a rectangle, you multiply length by width - and if the measurements are in feet, the area will be in square feet. For other geometric figures, there are other formulae.
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Calculating square feet is calculating the area. For simple, regular shapes there are formulae, For more complicated shapes, it may be necessary to break up the area into simpler shapes, find their areas and sum these together. For even more complicated areas it may not be possible to calculate the area: the best that can be done is estimating it.
5000 square feet is a measure of area - whether in brass or anything else. The area can be in a variety of shapes and calculating it will depend on that shape.
Paint coverage differs depending on brand and type of paint. Most (if not all) paint cans will indicate that one gallon covers so many square feet. For example, Paint A says one gallon covers 200 square feet. That means 200 square feet will require one gallon, 50 square feet will require one quart, 400 square feet will require two gallons, etc.
You don't use a ream size for linerboard. The weight is per 1000 square feet of board. EI 42# liner weights 42#s per MSF (thousand square feet).
Is this a trick question? You only need three figures if you are calculating cubic feet. You have just described a "Box" not a backsplash (normally figured in linear feet).
Square feet are square feet. There is not a measure called radius square feet.