Linear feet measure something in only one dimension. For example, when finding the length of a bedroom wall, measure from one corner to another and describe the length of the wall
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A linear foot is a unit of length. A square foot is a unit of area. The two units are therefore incompatible.
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A square foot is a measure or area a linear foot is a
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I've never heard them used together but if it helps I'll tell you what I know about cabinet pricing. I was priced custom cabinets @ 85 dollars a linear foot. I have 32 feet of wall.
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