How can one get the size of a selected subPath without breaking apart?

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public void GetDistancePoint()
        {
            Shape shape = this.app.ActiveShape;
            Segments segments = shape.Curve.Segments;
            for (int i = 1; i <= segments.Count; i++)
	    {
                if(segments[i ].Selected)
                {
                    MessageBox.Show(segments[i ].StartNode.GetDistanceFrom(segments[i ].EndNode).ToString());
                }
	   }
            
        }