\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}