6 (if it is a circle)
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Yes, the radius is half the diameter. (Eg, if the DIAMETER is 6, the RADIUS would be 3).
The radius of a circle is half the diameter, so the radius of a 6 inch diameter circle is 3 in.
A circle with radius of 3 inches doesn't have a diameter of 10 inches. If the radius is 3, then the diameter is 6, and the circumference is (6 pi) = 18.85 . (rounded) If the diameter is 10, then the radius is 5, and the circumference is (10 pi) = 31.42 . (rounded) The diameter is always double the radius, and the radius is always half of the diameter.
Radius is merely..., diameter/2 3 inches/2 = 1.5 inches in radius ==============
The radius of the circle is 1.5 units and the diameter is 3 units.