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\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}