CurveContains Method 
Name  Description  

Contains(Point3d) 
Computes the relationship between a point and a closed curve region.
This curve must be closed or the return value will be Unset.
Both curve and point are projected to the World XY plane.
 
Contains(Point3d, Plane) 
Computes the relationship between a point and a closed curve region.
This curve must be closed or the return value will be Unset.
 
Contains(Point3d, Plane, Double) 
Computes the relationship between a point and a closed curve region.
This curve must be closed or the return value will be Unset.
