\input{preamble-standalone.ltx} \begin{document} % Ex. No. 149 (Section 21.3.2 : Example a mediator) \begin{tikzpicture}[scale=.5] \tkzDefPoint(0,0){A} \tkzDefPoint(2,2){B} \tkzDrawCircle[color=blue](B,A) \tkzDrawCircle[color=blue](A,B) \tkzInterCC(B,A)(A,B)\tkzGetPoints{M}{N} \tkzDrawLine(A,B) \tkzDrawPoints(M,N) \tkzDrawLine[color=red](M,N) \end{tikzpicture} \end{document}