public override object Clone()
{
NTriangle clonedFigure = base.Clone() as NTriangle;
clonedFigure.PathFigure = PathFigure.Clone();
clonedFigure.PathFigure.IsClosed = true;
clonedFigure.line1 = line1.Clone();
clonedFigure.line2 = line2.Clone();
return(clonedFigure);
}