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I am trying to create a polynomial to fit around the edge of this glass shape, however, the polynomial that "FitPoly" creates is not the same when graphed as a separate "f(x)" function even though it is the same graph... see below:
Files:
Screen Shot 202...
The same problem 
All the commands of the Fit* family are the best fit to a series of data points, but it's not guaranteed that the generated function passes through all the points.
Use the Polynomial command or the Spline command instead.
See also this thread: https://help.geogebra.org/t...
1) Please post your .ggb file
2) Try setting the rounding higher (Options -> Rounding)
or try fitploy(ListGlass,7) or fitploy(ListGlass,9) etc
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