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\input{preamble-standalone.ltx}
\begin{document}
% Ex. No. 206 (Section 24.7 : Option \tkzname{angles}: example 1)
\begin{tikzpicture}[scale=.75]
\tkzDefPoint(0,0){A}
\tkzDefPoint(5,0){B}
\tkzDefPoint(2.5,0){O}
\tkzDefPointBy[rotation=center O angle 60](B)
\tkzGetPoint{D}
\tkzDefPointBy[symmetry=center D](O)
\tkzGetPoint{E}
\tkzSetUpLine[color=Maroon]
\tkzDrawArc[angles](O,B)(0,180)
\tkzDrawArc[angles,](B,O)(100,180)
\tkzCompass[delta=20](D,E)
\tkzDrawLines(A,B O,E B,E)
\tkzDrawPoints(A,B,O,D,E)
\tkzLabelPoints(A,B,O,D,E)
\tkzMarkRightAngle(O,B,E)
\end{tikzpicture}
\end{document}
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