By seeing which line goes through the circle all the way.
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apparent diameter
to determine the radius if you only have the diameter, you divided the diameter by 2. then there you have it ! you have the radius !
The diameter by definition because a diameter of a given object is twice its radius.
To find the linear feet in a given diameter, you need to know the circumference (or perimeter) of the object. The formula to calculate the circumference is circumference = π × diameter. Without the circumference, it is not possible to determine the linear feet.
The diameter does not affect the length. It is a separate dimension. Diameter is the cross sectional measure of a circular object.