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\input{preamble-standalone.ltx}
\begin{document}
% Ex. No. 122 (Section 16.0.7 : Option \tkzname{tangential})
\begin{tikzpicture}[scale=.5,rotate=80]
\tkzDefPoints{0/0/A,6/0/B,1.8/4/C}
\tkzDefSpcTriangle[tangential,
name=T](A,B,C){_a,_b,_c}
\tkzDrawPolygon[red](A,B,C)
\tkzDrawPolygon[blue](T_a,T_b,T_c)
\tkzDrawPoints[red](A,B,C)
\tkzDrawPoints[blue](T_a,T_b,T_c)
\tkzDefCircle[circum](A,B,C)
\tkzGetPoint{O}
\tkzDrawCircle(O,A)
\tkzLabelPoints[red](A,B,C)
\tkzLabelPoints[blue](T_a,T_b,T_c)
\end{tikzpicture}
\end{document}
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