\input{preamble-standalone.ltx} \begin{document} % Ex. No. 77 (Section 11.5.1 : Random example and circle of Apollonius) \begin{tikzpicture}[scale=1] \tkzDefPoints{0/0/A,3/0/B} \def\coeffK{2} \tkzApolloniusCenter[K=\coeffK](A,B) \tkzGetPoint{P} \tkzDefApolloniusPoint[K=\coeffK](A,B) \tkzGetPoint{M} \tkzDefApolloniusRadius[K=\coeffK](A,B) \tkzDrawCircle[R,color = blue!50!black, fill=blue!20, opacity=.4](tkzPointResult,\tkzLengthResult pt) \tkzDefRandPointOn[circle through= center P through M] \tkzGetPoint{N} \tkzDrawPoints(A,B,P,M,N) \tkzLabelPoints(A,B,P,M,N) \tkzDrawSegments[red](N,A N,B) \tkzDrawPoints(A,B) \tkzDrawSegments[red](A,B) \tkzLabelCircle[R,draw,fill=green!10,% text width=3cm,% text centered](P,\tkzLengthResult pt-20pt)(-120)% { $MA/MB=\coeffK$\\$NA/NB=\coeffK$} \end{tikzpicture} \end{document}