A radius is half of a diameter.
Example
Diameter:4
Radius:2
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Radius = Diameter/2 Diameter = 2* Radius
A radius is one half of a diameter so divide by two to get from a diameter to a radius. Or you can multiply the radius by 2 to get to the diameter.
The diameter of a circle is twice its radius.
It is half of the diameter or radius = diameter/2
Yes, the radius is half of the diameter, therefore the diameter is twice the radius.