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\input{preamble-standalone.ltx}
\begin{document}
% Ex. No. 143 (Section 21.2.4 : More complex example)
\begin{tikzpicture}[scale=1.25]
\tkzDefPoint(0,1){J}
\tkzDefPoint(0,0){O}
\tkzDrawArc[R,line width=1pt,color=red](J,2.5 cm)(180,0)
\foreach \i in {0,-5,-10,...,-85,-90}{
\tkzDefPoint({2.5*cosd(\i)},{1+2.5*sind(\i)}){P}
\tkzDrawSegment[color=orange](J,P)
\tkzInterLC[R](P,J)(O,1 cm)
\tkzGetPoints{M}{N}
\tkzDrawPoints[red](N)
}
\foreach \i in {-90,-95,...,-175,-180}{
\tkzDefPoint({2.5*cosd(\i)},{1+2.5*sind(\i)}){P}
\tkzDrawSegment[color=orange](J,P)
\tkzInterLC[R](P,J)(O,1 cm)
\tkzGetPoints{M}{N}
\tkzDrawPoints[red](M)
}
\end{tikzpicture}
\end{document}
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