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+\input{preamble-standalone.ltx}
+\begin{document}
+
+% Ex. No. 142 (Section 18.1.3 : Circles inscribed and circumscribed for a given triangle)
+
+\begin{tikzpicture}[scale=1]
+ \tkzDefPoint(2,2){A}
+ \tkzDefPoint(5,-2){B}
+ \tkzDefPoint(1,-2){C}
+ \tkzDefCircle[in](A,B,C)
+ \tkzGetPoint{I} \tkzGetLength{rIN}
+ \tkzDefCircle[circum](A,B,C)
+ \tkzGetPoint{K} \tkzGetLength{rCI}
+ \tkzDrawPoints(A,B,C,I,K)
+ \tkzDrawCircle[R,blue](I,\rIN pt)
+ \tkzDrawCircle[R,red](K,\rCI pt)
+ \tkzLabelPoints[below](B,C)
+ \tkzLabelPoints[above left](A,I,K)
+ \tkzDrawPolygon(A,B,C)
+\end{tikzpicture}
+
+\end{document} \ No newline at end of file