Since with circles the radius is half the diameter, the diameter would be 6 cm.
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If the diameter is what you are talking about that is 6 cm, you must divide that number by two to find the radius because the radius is half a diameter. The radius of a circle with a diameter of 6 cm. would be 3 cm.
radius 5 cm diameter 10 cm
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.
10 cm (diameter is double the radius)
if a radius is 5cm the diameter is 10cm rule- you double the radius