[Tex/LaTex] draw curved arrow

tikz-pgf

How can you make my two arrows more like the ones in the photo.

arrow

\documentclass[10pt, border=.3cm]{standalone}
\usepackage{tikz}
\begin{document}
\begin{tikzpicture}
\draw (0,0)--(4,1)--(4,7)--(0,6)--(-4,7)--(-4,1)--cycle;
\draw(0,0)--(0,6);
\node (a) at (.715, 6.5) {};
\node (b) at (-.715, 6.5) {};
\draw[->] (a)  to [out=120,in=60] (b);

\draw (9,7)--(13,7)--(12,3.5)--(13,0)--(9,0)--(8,3.5)--cycle;
\draw(12,3.5)--(8,3.5);
\draw(13,7)--(9.175,7.1)--(9.125,7.);
\draw(13,0)--(9.14,-.12)--(9.1,0);

\node (d) at (12.75, 3.8) {};
\node (c) at (12.5, 3.2) {};
\draw[->] (c)  to [out=90,in=90] (d);

\end{tikzpicture}
\end{document}

Best Answer

Place the points (c) and (d) with the same separation used in (a) and (b). Use proper values for in and out keywords, and control the "roundness" of the curve with the looseness keyword:

\documentclass[10pt, border=.3cm]{standalone}
\usepackage{tikz}
\begin{document}
\begin{tikzpicture}
\draw (0,0)--(4,1)--(4,7)--(0,6)--(-4,7)--(-4,1)--cycle;
\draw(0,0)--(0,6);
\node (a) at (.715, 6.5) {};
\node (b) at (-.715, 6.5) {};
\draw[->] (a)  to [out=90,in=90, looseness=2] (b);


\draw (9,7)--(13,7)--(12,3.5)--(13,0)--(9,0)--(8,3.5)--cycle;
\draw(12,3.5)--(8,3.5);
\draw(13,7)--(9.175,7.1)--(9.125,7.);
\draw(13,0)--(9.14,-.12)--(9.1,0);

\node (d) at (12.5, 3.5 + .715) {};
\node (c) at (12.5, 3.5 - .715) {};
\draw[->] (c)  to [out=0,in=0,looseness=2] (d);

\end{tikzpicture}
\end{document}

Result:

Result

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