Circle Constructor 
Name  Description  

Circle(Double) 
Initializes a circle with center (0,0,0) in the world XY plane.
 
Circle(Arc) 
Initializes a circle from an arc.
 
Circle(Plane, Double) 
Initializes a circle on a plane with a given radius.
 
Circle(Point3d, Double) 
Initializes a circle parallel to the world XY plane with given center and radius.
 
Circle(Plane, Point3d, Double) 
Initializes a circle parallel to a given plane with given center and radius.
 
Circle(Point3d, Point3d, Point3d) 
Initializes a circle through three 3d points. The start/end of the circle is at point1.
 
Circle(Point3d, Vector3d, Point3d) 
Initializes a circle from two 3d points and a tangent at the first point.
The start/end of the circle is at point "startPoint".
