None, since there can be no conversion.
A linear (or lineal) foot is a measure of length in 1-dimensional space, often used for products which are sold in standard widths. A square foot is a measure of area in 2-dimensional space. The two measure different things and, according to basic principles of dimensional analysis, any attempt at conversion from one to the other is fundamentally flawed.
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A linear foot is a unit of distance. A square foot is a unit of area. The two units are therefore incompatible.
Lineal metres = Square metres/Width of the boards.
The answer will depend on whether the 6 feet refers to the radius or diameter of the circle and which length is being measured in lineal feet.
Lineal metres = Square metres/Width of the boards.
A circle with a diameter of 9 feet has a perimeter of 28.3 feet.