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\input{preamble-standalone.ltx}
\begin{document}
% Ex. No. 149 (Section 18.1.10 : Orthogonal circle of given center)
\begin{tikzpicture}[scale=.75]
\tkzDefPoints{0/0/O,1/0/A}
\tkzDefPoints{1.5/1.25/B,-2/-3/C}
\tkzDefCircle[orthogonal from=B](O,A)
\tkzGetPoints{z1}{z2}
\tkzDefCircle[orthogonal from=C](O,A)
\tkzGetPoints{t1}{t2}
\tkzDrawCircle(O,A)
\tkzDrawCircle[thick,color=red](B,z1)
\tkzDrawCircle[thick,color=red](C,t1)
\tkzDrawPoints(t1,t2,C)
\tkzDrawPoints(z1,z2,O,A,B)
\tkzLabelPoints(O,A,B,C)
\end{tikzpicture}
\end{document}
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