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\input{preamble-standalone.ltx}
\begin{document}
% Ex. No. 123 (Section 19.1.6 : Coloured Apollonius circles for a given segment)
\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}
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