\input{preamble-standalone.ltx} \begin{document} % Ex. No. 200 (Section 24.1 : Option \tkzname{towards}) \begin{tikzpicture} \tkzDefPoint(0,0){O} \tkzDefPoint(2,-1){A} \tkzDefPointBy[rotation= center O angle 90](A) \tkzGetPoint{B} \tkzDrawArc[color=blue,<->](O,A)(B) \tkzDrawArc(O,B)(A) \tkzDrawLines[add = 0 and .5](O,A O,B) \tkzDrawPoints(O,A,B) \tkzLabelPoints[below](O,A,B) \end{tikzpicture} \end{document}