Hi all
Just to further clarify on the second of my too
questions:

I am not concerned with volume. I am trying to work
out area. The area of a crossection (a number of
crossections actually). And it seems to me also that
the average diameter will not have a direct
relationship to the area, surely? For example, a line
may have its longest diameter at 20cm and its shortest
diameter at 0cm. Although its average diameter is
therefore 10cm, its area is 0. That's why I thought
there may be a more accurate way of working it out.
For example, wouldn't an elipse use a different
formula for working out the area than a circle? What I
am measuring is closer to an elipse. However it is
more irregular. It may aid you if I give you the image
of a lake. How would we work out the area of a lake,
when our available data is a number of diameter
measurements of the lake?
By the way I figured if I actually used the diameters
to plot out a map on graph paper, I could count the
little squares to find the area!! However, as I have
to do a large number of such calculations, that is not
practical. I feel sure there must be a suitable
formula.

Thank you!
Best wishes
Justin