Jtdylktuy

I have stumbled upon some weird behaviour regarding arcs and arrowheads.

Here is a MWE:

documentclass[tikz]{standalone}

    usepackage{tikz}

    usepackage{graphicx}

    usetikzlibrary{arrows.meta}

    defRad{2cm}

    begin{document}

        begin{tikzpicture} 

                            draw[blue, thick] (0:Rad) arc (0:360:Rad);

                            draw[orange,->]  (90:Rad)    arc (90:90-170:Rad);    

                            draw[orange,-{Triangle[length=1mm, width=1mm]}] (90:Rad) arc (90:90+170:Rad);

    end{tikzpicture}

    end{document}

If you look closely at the outcome, one can notice that the orange arcs bend differently:

I would rather use the triangular arrowheads, but it is the one that bends differently than the actual circle, so I can not use it as it seems to be inaccurate.

I appreciate your help.

All you need to do is to also load bending to cure this.

documentclass[tikz]{standalone}

usetikzlibrary{arrows.meta,bending}

defRad{2cm}

begin{document}

begin{tikzpicture} 

 draw[blue, thick] (0:Rad) arc (0:360:Rad);

 draw[orange,->]  (90:Rad)    arc (90:90-170:Rad);    

 draw[orange,-{Triangle[length=1mm, width=1mm]}] (90:Rad) arc (90:90+170:Rad);

end{tikzpicture}

end{document}

Explanation: pgfmanual p. 194-195