This question cannot be answered sensibly. A square foot is a measure of area, with dimensions [L2]. A linear foot is a measure of distance, with dimensions [L]. Basic dimensional analysis teaches that you cannot convert between measures with different dimensions such as these without additional information.
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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.
A linear foot is the same as a foot so the answer is 5.
A linear foot is the same as a foot. So, an 18-foot diameter circle would measure 18 linear feet in diameter!
A linear foot is distance. A square foot is area. One square foot is the area of some square tiles used on floors. Ten square feet is 1 foot x 10 feet or 2 feet x 5 feet. Don't confuse this with a 10 foot square which is 10 feet by 10 feet which equals 100 square feet.
The foot is a linear measurement. You cannot convert a linear measurement to an area measurement.