\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}