The radius is always half the diameter, so the answer is 6.
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A circle with a 12 inch diameter has a 6 inch radius.
diameter is 2 times the radius 24
12 is the diameter if the radius is 6
As the diameter of a circle is twice the radius, a circle with a 6-foot radius would have a diameter of 6 x 2 or 12 feet.
12 inches because the radius is half of the diameter, and 6 x 2 is 12.