Radius is from the center of a circle to the outer edge.
Diameter is from the outer edge to the opposite outer edge, i.e., through the center.
The diameter has twice the length of the radius.
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a radius is half the diameter of a circle
The radius of a circle is 1/2 of the diameter.
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.
A radius is half of a diameter. Example Diameter:4 Radius:2