to get the diameter from the radius you simply multiply the radius by 2 since the radius is half the diameter.
d=2r
where d = diameter and r = radius
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The radius is half the diameter. So, if the diameter is 8, then the radius is 4.
diameter = 2*radius
The diameter of a circle is twice its radius.
i think the radius is half of the diameter
If the diameter is 15 then the radius is 7.5.