This .NET class wraps the AcGiGeometry ObjectARX class. 

Geometry abstracts out the commonality between ViewportGeometry and WorldGeometry. To maintain their original signatures, WorldGeometry and ViewportGeometry now derive from Geometry. 

Autodesk.AutoCAD.GraphicsInterface.Geometry

Public abstract Class Geometry
Inherits RXObject

public abstract class Geometry : RXObject;