\input{preamble-standalone.ltx} \begin{document} % Ex. No. 41 (Section 6.1.6 : Option \tkzname{euler}) \begin{tikzpicture}[scale=1] \tkzDefPoints{0/0/A,6/0/B,0.8/4/C} \tkzDefSpcTriangle[medial, name=M](A,B,C){_A,_B,_C} \tkzDefTriangleCenter[euler](A,B,C) \tkzGetPoint{N} % I= N nine points \tkzDefTriangleCenter[ortho](A,B,C) \tkzGetPoint{H} \tkzDefMidPoint(A,H) \tkzGetPoint{E_A} \tkzDefMidPoint(C,H) \tkzGetPoint{E_C} \tkzDefMidPoint(B,H) \tkzGetPoint{E_B} \tkzDefSpcTriangle[ortho,name=H](A,B,C){_A,_B,_C} \tkzDrawPolygon[color=blue](A,B,C) \tkzDrawCircle(N,E_A) \tkzDrawSegments[blue](A,H_A B,H_B C,H_C) \tkzDrawPoints(A,B,C,N,H) \tkzDrawPoints[red](M_A,M_B,M_C) \tkzDrawPoints[blue]( H_A,H_B,H_C) \tkzDrawPoints[green](E_A,E_B,E_C) \tkzAutoLabelPoints[center=N, font=\scriptsize](A,B,C,% M_A,M_B,M_C,% H_A,H_B,H_C,% E_A,E_B,E_C) \tkzLabelPoints[font=\scriptsize](H,N) \tkzMarkSegments[mark=s|,size=3pt, color=blue,line width=1pt](B,E_B E_B,H) \end{tikzpicture} \end{document}