6 because the radius is half of the diameter.
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12 feet. The diameter of a circle is twice its radius.
Radius of circle: 12/2 = 6 units
The diameter is double the radius of a circle. Therefore the radius is 12/2 or 6 yards.
The radius of a circle is always half of the distance of the diameter. If you have a 24 mm diameter - then the radius would be 12 mm.
12