arc180_new.svg http://inkscape.13.x6.nabble.com/file/n4967689/arc180_new.svg
after compiling Inkscape with this new function, the original file arc180_org.svg was reloaded and converted to Beziers as before, to produce the file arc180_new.svg, attached here. In the file arc180_new.svg, the top arc is identical to the original version, as expected. The bottom arc now has a typical Bezier control arm length of 26.26437, which is consistent with the formula (4/3)*tan(theta/4), as desired.
The two types of arcs are now rendered using the same approximation method, as hoped for. However, it is not possible to commit this change directly to the Inkscape repository. Since the change occurs in lib2geom code, it will be necessary for the proposed change to be reviewed by someone in that development group.
Alvin
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