\input{preamble-standalone.ltx} \begin{document} % Ex. No. 141 (Section 18.1.2 : Example with option \tkzname{diameter}) \begin{tikzpicture}[scale=1] \tkzDefPoint(0,0){A} \tkzDefPoint(2,2){B} \tkzDefCircle[diameter](A,B) \tkzGetPoint{O} \tkzDrawCircle[blue,fill=blue!20](O,B) \tkzDrawSegment(A,B) \tkzDrawPoints(A,B,O) \tkzLabelPoints(A,B,O) \end{tikzpicture} \end{document}