public int AngleOfPoint(Point point)
 {
     return((int)System.Math.Truncate(CircleF.AngleOfPoint(CircleF.FromCircle(this), new PointF((float)point.X, (float)point.Y))));
 }
 public float AngleOfPoint(PointF point)
 {
     return(CircleF.AngleOfPoint(this, point));
 }