If the 6.6mm in your question is the radius, then times the 6.6 x 2 to get the diameter (6.6 x 2 = 13.2).
Obviously, if the 6.6mm is already the full size of the circle, then 6.6mm is the diameter!
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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