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

% Ex. No. 134 (Section 20.2.3 : Exinscribed circles.)

\begin{tikzpicture}[scale=1]
\tkzDefPoints{0/0/A,4/0/B,1/2.5/C}
\tkzDrawPolygon(A,B,C)
\tkzDefCircle[ex](B,C,A)
\tkzGetPoint{Jc} \tkzGetSecondPoint{Tc}
\tkzGetLength{rJc}
\tkzDrawCircle[R](Jc,{\rJc pt})
\tkzDrawLines[add=0 and 1](C,A C,B)
\tkzDrawSegment(Jc,Tc)
\tkzMarkRightAngle(Jc,Tc,B)
\tkzDrawPoints(A,B,C,Jc,Tc)
\end{tikzpicture}

\end{document}