If by 'linear feet', you mean the circumference, which I don't know what else you might mean, then the answer is this:
c= pi x d
c = pi x 5.5
c = about 17.3
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188.4
28.26
If you mean how many feet AROUND the circle, that is the circumference. Multiply the diameter (3 feet) by pi- 3.14. About 9.42 feet
To find the circumference of a circle with a diameter of 6 feet, you first need to calculate the radius, which is half of the diameter. So, the radius would be 6 feet divided by 2, which equals 3 feet. The formula for the circumference of a circle is 2πr, where r is the radius. Therefore, the circumference of a circle with a 6-foot diameter would be 2 x π x 3 feet, which equals approximately 18.85 feet.
A 72-inch diameter circle has an area of: 28.3 square feet.