\input{preamble-standalone.ltx}
\begin{document}

% Ex. No. 50 (Section  8.1.3 : Rotation avec  \tkzname{shift} et \tkzname{scope} )

\begin{tikzpicture}[scale=.75,rotate=90]
 \tkzDefPoint[label=right:$A_n$](2,3){A}
 \begin{scope}[shift={(A)}]
   \tkzDefPoint[label= right:$B_n$](31:3){B}
   \tkzDefPoint[label= right:$C_n$](158:3){C}
\end{scope}
  \tkzDrawSegments[color=red,%
           line width=1pt](A,B A,C)
  \tkzDrawPoints[color=red](A,B,C)
\end{tikzpicture}

\end{document}
