The answer depends on whether the 4 foot measure is the radius or the circumference.
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Its radius is: 8/2 = 4ft
The cord of a circle that contains the center of that circle is a diameter of that circle.
You do a diameter circle!!
A circle with a diameter of 28 is a circle.
The radius of a circle is half the diameter so if the radius of a circle is r, then the diameter is 2r.