8 inches; the diameter of a circle is twice its radius.
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Two inches. The radius of a circle is 1/2 of the diameter.
The diameter is double the radius, so 8 inches.
4 inches. The radius = 1/2 of the diameter
In order to fully understand what the radius of a given circle is, you must know the diameter. The diameter is the distance across the circle through the center. The radius of a circle is half the diameter. For example, if the diameter of a circle is 8 inches, then the radius would be 4 inches.
The radius is one half the diameter so if the diameter is 8 inches then the radius is 4 inches.