It depends on what you mean by a 7 foot circle.
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A linear foot is the same as a foot. So, an 18-foot diameter circle would measure 18 linear feet in diameter!
The answer depends on what aspect of the circle you would consider to be a linear measure. The diameter of the circle would be 7 ft.
The circumference of a 7-foot diameter circle using 3.14 for Pi is: 21.98 feet (diameter x Pi = circumference).
An 8-foot diameter circle has a circumference of about 25.132 inches.
The circumference of a circle with a 27 foot diameter is about 84.82 feet. (C = d x Pi).