# Draw arrow on sides of triangle

### MWE:

\documentclass[12pt]{article}
\usepackage{pgf}
\usepackage{tikz}
\usepackage{pgfplots}
\begin{document}
\begin{tikzpicture}
\draw [line width=1pt] (0,5)-- (0,0);
\draw [line width=1pt] (5,0)-- (0,5);
\draw [line width=1pt] (0,0)-- (5,0);
\draw [fill=black] (0,5) circle (1.5pt);
\draw[color=black] (0.0,5.5) node {$A$};
\draw [fill=black] (0,0) circle (1.5pt);
\draw[color=black] (0.0,-0.5) node {$B$};
\draw [fill=black] (5,0) circle (1.5pt);
\draw[color=black] (5.0,-0.5) node {$C$};
\end{tikzpicture}
\end{document}


### Question:

How can I draw direction arrow on each lines of triangle? (all possible style of arrows)

Maybe I misread the question, but if you want to vary the type of the arrow you may want to use

\documentclass[12pt]{article}
\usepackage{tikz}
\usetikzlibrary{decorations.markings}
\begin{document}
% based on https://tex.stackexchange.com/a/39282/121799
\tikzset{->-/.style n args={2}{decoration={
markings,
mark=at position #1 with {\arrow{#2}}},postaction={decorate}}}
\begin{tikzpicture}[bullet/.style={circle,inner sep=1.5pt,fill}]
\path  (0,5) node[bullet,label=above:$A$](A){}
(0,0) node[bullet,label=below:$B$](B) {}
(5,0) node[bullet,label=below:$C$](C) {};
\foreach \X/\Arrow [remember=\X as \LastX (initially C)]in
{A/latex,B/stealth,C/>}
{\draw[line width=1pt,->-={0.5}{\Arrow}] (\LastX) -- (\X);}
\end{tikzpicture}
\end{document}


As for your comment: this draws three triangles. Is that what you are looking for?

\documentclass[12pt]{article}
\usepackage{tikz}
\usetikzlibrary{decorations.markings}
\begin{document}
% based on https://tex.stackexchange.com/a/39282/121799
\tikzset{->-/.style n args={2}{decoration={
markings,
mark=at position #1 with {\arrow[line width=1pt]{#2}}},postaction={decorate}}}
\begin{tikzpicture}[bullet/.style={circle,inner sep=1.5pt,fill}]
\begin{scope}
\path  (0,5) node[bullet,label=above:$A$](A){}
(0,0) node[bullet,label=below:$B$](B) {}
(5,0) node[bullet,label=below:$C$](C) {};
\foreach \X [remember=\X as \LastX (initially C)] in  {A,B,C}
{\draw[line width=1pt,->-={0.5}{latex}] (\LastX) -- (\X);}
\end{scope}
\begin{scope}[xshift=6cm]
\path  (0,5) node[bullet,label=above:$A$](A'){}
(0,0) node[bullet,label=below:$B$](B') {}
(5,0) node[bullet,label=below:$C$](C') {};
\foreach \X [remember=\X as \LastX (initially C')]in  {A',B',C'}
{\draw[line width=1pt,->-={0.5}{stealth}] (\LastX) -- (\X);}
\end{scope}
\begin{scope}[yshift=-6.6cm]
\path  (0,5) node[bullet,label=above:$A$](A''){}
(0,0) node[bullet,label=below:$B$](B'') {}
(5,0) node[bullet,label=below:$C$](C'') {};
\foreach \X [remember=\X as \LastX (initially C'')]in  {A'',B'',C''}
{\draw[line width=1pt,->-={0.5}{>}] (\LastX) -- (\X);}
\end{scope}
\end{tikzpicture}
\end{document}


• No friend, you understand my question better And the answer that I had hoped for almost got to be found. Only one request is please give me three different codes with arrows(three triangle with arrows) that you mentioned. Mar 14 '19 at 4:27
• Should i increase size of arrows? i am waiting....... Mar 14 '19 at 4:31
• @Sandy The three different arrows are already in \foreach \X/\Arrow [remember=\X as \LastX (initially C)]in {A/latex,B/stealth,C/>}, where they are set as latex, stealth and standard types. Yes, you can make the arrows thicker e.g. by saying {\arrow[line width=2pt]{#2}}} instead of {\arrow{#2}}}.
– user121799
Mar 14 '19 at 4:34
• @Sandy Yes, I will be happy to follow your request if I understand it. You want three triangles? If so, do they all have the same dimensions? Are the next to each other? Or do you want 3 arrow heads on a given edge?
– user121799
Mar 14 '19 at 4:45
• @Sandy Just for additional information, here is a (quite complete) list of available arrow tips.
– user156344
Mar 14 '19 at 5:08
%\documentclass[border=2mm]{standalone}
\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{decorations.markings}
\begin{document}
\begin{tikzpicture}

\draw [fill=black] (0,5) circle (1.5pt);
\draw[color=black] (0.0,5.5) node {$A$};
\draw [fill=black] (0,0) circle (1.5pt);
\draw[color=black] (0.0,-0.5) node {$B$};
\draw [fill=black] (5,0) circle (1.5pt);
\draw[color=black] (5.0,-0.5) node {$C$};

\begin{scope}[very thick,decoration={
markings,
mark=at position 0.5 with {\arrow{>}}}
]
\draw [line width=1pt,postaction={decorate}] (0,5)-- (0,0);
\draw [line width=1pt,postaction={decorate}] (5,0)-- (0,5);
\draw [line width=1pt,postaction={decorate}] (0,0)-- (5,0);
\end{scope}
\end{tikzpicture}
\end{document}

• Is it possible of article document type? Mar 14 '19 at 4:36
• @Sandy Yes...sure Mar 14 '19 at 4:37
• Would you please modified your codes for article? Mar 14 '19 at 5:07
• @Sandy done... see the code above.... Mar 14 '19 at 5:14