\input{preamble-standalone.ltx} \begin{document} % Ex. No. 144 (Section 18.1.5 : Euler's circle for a given triangle with option \tkzname{euler}) \begin{tikzpicture}[scale=.75] \tkzDefPoint(5,3.5){A} \tkzDefPoint(0,0){B} \tkzDefPoint(7,0){C} \tkzDefCircle[euler](A,B,C) \tkzGetPoint{E} \tkzGetLength{rEuler} \tkzDefSpcTriangle[medial](A,B,C){M_a,M_b,M_c} \tkzDrawPoints(A,B,C,E,M_a,M_b,M_c) \tkzDrawCircle[R,blue](E,\rEuler pt) \tkzDrawPolygon(A,B,C) \tkzLabelPoints[below](B,C) \tkzLabelPoints[left](A,E) \end{tikzpicture} \end{document}