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% !TeX TXS-program:compile = txs:///pdflatex

\documentclass[margin=5mm]{standalone}
\usepackage{tikz3d-fr}

\begin{document}

\begin{EnvTikzEspace}[UniteX={-152.5:1.8cm},UniteY={-10:2.5cm},UniteZ={90:2.75cm}]
	\draw[] (0,0,0)--(4,0,0) ;
	\draw[] (0,0,0)--(0,2.5,0) ;
	\draw[] (0,0,0)--(0,0,1.25) ;
	\draw (0,0,0) node[below] {$O$} ;
	\PlacePointsEspace[]{A/{2*sqrt(3)},0,0/hg B/0,2,0/hd C/0,0,1/hg K/{0.5*sqrt(3)},1.5,0/bd}
	\TraceSegmentsEspace[darkgray,very thick]{A/B B/C C/A C/K}
	\draw[->,>=latex] (0,0,0)--(1,0,0) node[midway,above] {$\vec{\imath}$} ;
	\draw[->,>=latex] (0,0,0)--(0,1,0) node[midway,above] {$\vec{\jmath}$} ;
	\draw[->,>=latex] (0,0,0)--(0,0,1) node[midway,left] {$\vec{k}$} ;
\end{EnvTikzEspace}

\end{document}