In the case of a circle, or spehere, the diameter is twice the radius.
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it is half the diameter e.g 10cm diameter = 5 cm radius
The radius is always exactly half of the diameter, so if the radius is 8 cm, then the diameter is 16 cm.
The length of the diameter will be 30 cm if the radius is 15 cm.
The diameter is double the radius, and the radius is 1/2 of the diameter.If the radius is 8 cm, then the diameter is 16 cm.
Diameter = 2*Radius. So if the diameter is 16 cm, the radius must be 8 cm.