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\input{preamble-standalone.ltx}
\begin{document}
% Ex. No. 150 (Section 19.1.1 : Circles and styles, draw a circle and color the disc)
\begin{tikzpicture}
\tkzDefPoint(0,0){O}
\tkzDefPoint(3,0){A}
\tkzDrawCircle[color=blue](O,A)
\tkzDrawCircle[diameter,color=red,%
line width=2pt,fill=red!40,%
opacity=.5](O,A)
\edef\rayon{\fpeval{0.25*exp(1)}}
\tkzDrawCircle[R,color=orange](O,\rayon cm)
\end{tikzpicture}
\end{document}
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