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\input{preamble-standalone.ltx}
\begin{document}
% Ex. No. 146 (Section 18.1.7 : Circles exinscribed to a given triangle option \tkzname{ex})
\begin{tikzpicture}[scale=.6]
\tkzDefPoint(0,0){A}
\tkzDefPoint(3,0){B}
\tkzDefPoint(1,2.5){C}
\tkzDefCircle[ex](A,B,C) \tkzGetPoint{I}
\tkzGetLength{rI}
\tkzDefCircle[ex](C,A,B) \tkzGetPoint{J}
\tkzGetLength{rJ}
\tkzDefCircle[ex](B,C,A) \tkzGetPoint{K}
\tkzGetLength{rK}
\tkzDefCircle[in](B,C,A) \tkzGetPoint{O}
\tkzGetLength{rO}
\tkzDrawLines[add=1.5 and 1.5](A,B A,C B,C)
\tkzDrawPoints(I,J,K)
\tkzDrawPolygon(A,B,C)
\tkzDrawPolygon[dashed](I,J,K)
\tkzDrawCircle[R,blue!50!black](O,\rO)
\tkzDrawSegments[dashed](A,K B,J C,I)
\tkzDrawPoints(A,B,C)
\tkzDrawCircles[R](J,{\rJ} I,{\rI} K,{\rK})
\tkzLabelPoints(A,B,C,I,J,K)
\end{tikzpicture}
\end{document}
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