When you double the diameter, the circumference is also doubled.
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The diameter of a circle is doubled if the circumference is doubled.
Since the equation for circumference is pi*d then if you double the diameter the circumference will be doubled.
If you double the circumference. the diameter like wise would double.
The circumference of a circle with a diameter of 25 is: 78.54
If the diameter of a circle is 9 the circumference is: 28.3