That depends on what exactly the "9.9 ft" is.
Is it the radius of the circle ?
Is it the circumference ?
Each of those choices produces a different diameter, and you've
neglected to specify that information in your question.
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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.
The diameter of a circle is twice its radius