If you double the circumference. the diameter like wise would double.
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The diameter of a circle is doubled if the circumference is doubled.
When you double the diameter, the circumference is also doubled.
Since the equation for circumference is pi*d then if you double the diameter the circumference will be doubled.
The circumference is tripled.C=pi*d, so pi*(3d) = 3C, where d is diameter and C is circumference.
If the diameter of a circle is 9 the circumference is: 28.3