4 units
The radius of a circle is the distance from the center to the edge. The diameter of a circle is the distance from the edge, going through the center, to the opposite edge.
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8 inches; the diameter of a circle is twice its radius.
8 inches. Radius is ½ diameter.
If the radius is 8 feet then the diameter will be 16 feet.
Diameter = 2*radius = 16 units
Radius of circle: 8/2 = 4 inches