\input{preamble-standalone.ltx} \begin{document} % Ex. No. 120 (Section 19.1.3 : 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}