You cannot have linear square footage because:
"linear" means the measurement is 1-dimensional.
"square" means the measurement is 2-dimensional.
The above two statements are mutually contradictory!
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There are linear feet, and square feet, but no "linear square feet".
Multiply by 144.
In order to calculate the square footage you need to find the length and the width of the room in feet. You multiply the length and the width to give you the square footage of the room
I think (hope) you mean square, not linear. Answer is 18 ft2
If you know the length ft.(linear) and you wish to know its area (sq. footage), you must also know the width. Length (ft.) x Width (ft.) equals area or sq. feet. Linear in this case refers to length.