\input{preamble-standalone.ltx} \begin{document} % Ex. No. 204 (Section 24.5 : Option \tkzname{R with nodes}) \begin{tikzpicture} \tkzDefPoint(0,0){O} \tkzDefPoint(2,-1){A} \tkzDefPoint(1,1){B} \tkzCalcLength(B,A)\tkzGetLength{radius} \tkzDrawArc[R with nodes](B,\radius pt)(A,O) \end{tikzpicture} \end{document}