\input{preamble-standalone.ltx} \begin{document} % Ex. No. 137 (Section 20.5.1 : Example) \begin{tikzpicture} \tkzInit[xmax=5,ymax=5] \tkzGrid \tkzClip \tkzDefPoint(0,0){A} \tkzDefPoint(2,2){O} \tkzDefPoint(4,4){B} \tkzDefPoint(6,6){C} \tkzDrawPoints(O,A,B,C) \tkzLabelPoints(O,A,B,C) \tkzDrawCircle(O,A) \tkzClipCircle(O,A) \tkzDrawLine(A,C) \tkzDrawCircle[fill=red!20,opacity=.5](C,O) \end{tikzpicture} \end{document}