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\input{preamble-standalone.ltx}
\begin{document}
% Ex. No. 72 (Section 8.10.1 : Example with \tkzcname{tkzAutoLabelPoints})
\begin{tikzpicture}[scale=1.25]
\tkzDefPoint(2,1){O}
\tkzDefRandPointOn[circle=center O radius 1.5cm]
\tkzGetPoint{A}
\tkzDrawCircle(O,A)
\tkzDefPointBy[rotation=center O angle 100](A)
\tkzGetPoint{C}
\tkzDefPointBy[rotation=center O angle 78](A)
\tkzGetPoint{B}
\tkzDrawPoints(O,A,B,C)
\tkzDrawSegments(C,B B,A A,O O,C)
\tkzDefCentroid(A,B,C,O)
\tkzDrawPoint(tkzPointResult)
\tkzAutoLabelPoints[center=tkzPointResult,
dist=.3,red](O,A,B,C)
\end{tikzpicture}
\end{document}
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