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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!
There are 20 linear feet across the diameter; and 20π ≈ 62.83 linear feet around the circumference.
To find the circumference of a circle with an 8-foot diameter, you would use the formula C = πd, where C is the circumference, π is approximately 3.14, and d is the diameter. So, C = 3.14 x 8 = 25.12 feet. The circumference represents the linear distance around the circle, so in this case, there are 25.12 linear feet in an 8-foot diameter circle.
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.
Circumference = pi*d = 12.6 feet, approx.