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Linear feet and feet means the same thing.
Linear describes a relationship that exhibits a straight line when plotted on a graph, for example. Non liner is any thing other than a straight line.
The graph, in the Cartesian plane, of a linear equation is a straight line. Conversely, a straight line in a Cartesian plane can be represented algebraically as a linear equation. They are the algebraic or geometric equivalents of the same thing.
There are 0.3408 meters in one foot, so there are 6.096 meters in 20 feet. A linear meter is the same thing as a meter.
There is no such thing as a "square liter," and even if there were, it wouldn't be a linear unit like an inch.