Diameter = 2*radius = 16 units
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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.
Radius of circle: 8/2 = 4 inches
Radius = Diameter / 2 In this case, diameter = 8 cm so radius = 4 cm