Describes a circle in 3D space To create a circle there are several ways: Part.Geom2d.Circle2d() Creates a default circle with center (0,0) and radius 1 Part.Geom2d.Circle2d(circle) Creates a copy of the given circle Part.Geom2d.Circle2d(circle, Distance) Creates a circle parallel to given circle at a certain distance Part.Geom2d.Circle2d(Center,Radius) Creates a circle defined by center and radius Part.Geom2d.Circle2d(Point1,Point2,Point3) Creates a circle defined by three non-linear points Get the circle center defined by three points The radius of the circle.