Quote:
Originally Posted by ossiblue
Area (open space) of a circle (pipe): A=pi x r2.
The value of the area will not change as the shape of the circle is modified. That means, as the circle is crushed, the radius shrinks in one direction but expands in the other so that the area remains the same. ?
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Maybe I am missunderstanding what you are saying, but as you "crush a circle" the Area certainty goes down. Think about the extreme case where you crush it to a nearly flat elipsoid or oval, the area is almost zero.
It is the circumference that remains constant, and that is where the interface between the tube is, and the dimension that should be used