The diameter of a circle is twice the radius.
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Yes, the radius is half the diameter. (Eg, if the DIAMETER is 6, the RADIUS would be 3).
It is: 2 to 1
circumference = 2*pi*radius or pi*diameter
Since radius is half of a diameter, therefore 12 x 2 = 24
to calculate circumference you find a circles radius or diameter. you do diameter times pi or radius times 2 times pi. the you have circumference!