\input{preamble-standalone.ltx} \begin{document} % Ex. No. 145 (Section 18.1.6 : Apollonius circles for a given segment option \tkzname{apollonius}) \begin{tikzpicture}[scale=0.75] \tkzDefPoint(0,0){A} \tkzDefPoint(4,0){B} \tkzDefCircle[apollonius,K=2](A,B) \tkzGetPoint{K1} \tkzGetLength{rAp} \tkzDrawCircle[R,color = blue!50!black, fill=blue!20,opacity=.4](K1,\rAp pt) \tkzDefCircle[apollonius,K=3](A,B) \tkzGetPoint{K2} \tkzGetLength{rAp} \tkzDrawCircle[R,color=red!50!black, fill=red!20,opacity=.4](K2,\rAp pt) \tkzLabelPoints[below](A,B,K1,K2) \tkzDrawPoints(A,B,K1,K2) \tkzDrawLine[add=.2 and 1](A,B) \end{tikzpicture} \end{document}