The answer is 9
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9 mm
Diameter = 2 x radius = 18 mm .
Diameter of circle = 2 * Radius of the circle.
Since diameter is twice its radius, the radius of this circle would be 60
The radius (radii) of a circle is 1/2 of the diameter. The radius of a circle with a 6.2 cm diameter is 3.1 cm.