  | ExtendWithFixedCurve(Boolean, Point3d, Point3d) |
Extends the feature line with a curved arc segment defined by three points.
This method adds a new fixed arc segment to either the beginning or end of the feature line,
creating a smooth curve that passes through the specified second point and ends at the target point.
The arc is calculated using the three-point arc definition method, providing precise control
over the arc's curvature and direction. This is useful when you need to create arcs with
specific geometric constraints.
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