Well, first of all, it has to be a circle or a sphere, otherwise it's perimeter, not circumference. But if your object is a circle or a sphere, the formula is C=pi x diameter. So the circumference of your object is 5pi
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apparent diameter
The diameter by definition because a diameter of a given object is twice its radius.
I don't believe there is a way to find the mass of an object knowing only the diameter of the object. If you had the volume, or some other measurements sure. the best bet would be just to weigh it, or find the volume using the principles of displacement.
The diameter does not affect the length. It is a separate dimension. Diameter is the cross sectional measure of a circular object.
A diameter is a property of circular objects. "12 inches" is not a circular object and so cannot have a diameter.