This question cannot be answered without more information. For a relationship to exist, you need two items. Only one is Ben - the diameter? What is the other? Area? Circumference? Radius? Please review your question and add the other component, thn it can be answered.
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The radius is half the diameter of a circle.
The diameter of any circle is twice its radius
diameter times pi(3.14159) equals cicumference
The radius is half the diameter.
The circumference is pi times the diameter.