Creates an elliptic arc based on parameters that define an ellipse and the portion of that ellipse that defines the arc. The spatial reference parameter is used if the center point parameter has a null spatial reference. If both spatial references are supplied, they must be equal.
Creates an elliptic arc segment from the given start and end points, and other parameters that define an ellipse. The z-value and m-value of the start and end points (if present) are used in the EllipticArcSegment.
Indicates if this arc is a portion of the boundary of a 2D circle. An elliptic arc is circular if the ellipse upon which it is based is a circle, meaning the lengths of its major and minor axes are equal.