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  • $\begingroup$ How come the RegionPlot of a space curve is a 2D plot? $\endgroup$ Commented Sep 3, 2014 at 13:58
  • 4
    $\begingroup$ @RahulNarain since one of the surfaces is a plane, the result is two dimensional on that plane. $\endgroup$ Commented Sep 3, 2014 at 13:59
  • $\begingroup$ The numerical answer here differs from @Pickett's numerical answer by a small but notable amount. $\endgroup$ Commented Sep 3, 2014 at 13:59
  • 2
    $\begingroup$ I wouldn't say "slightly affected" since the result differs from the symbolic one by 1 - 9.46689315/(10.9513) i.e. more than $10$%. $\endgroup$ Commented Sep 3, 2014 at 15:58
  • 1
    $\begingroup$ The update to V10.0.1 has improved the result to 3-4 digits of precision, which is still not as good an approximation as the length of the line produced by ContourPlot3D. (It takes a long time to compute, though. Not much bang for the buck, all in all.) $\endgroup$ Commented Sep 19, 2014 at 22:37