documentclass{standalone}
usepackage{tikz}
begin{document}
begin{tikzpicture}
    draw [line width=3mm,dash pattern=on 30 pt off 10 pt] plot [smooth cycle,tension=0.65] coordinates
     {(-1,-0.577) (0,1.155) (1,-0.577)};

    begin{scope}[xshift=3cm]
        draw [line width=3mm] plot [smooth cycle,tension=0.65] coordinates
        {(-1,-0.577) (0,1.155) (1,-0.577)};
    end{scope}
end{tikzpicture}
end{document}