\input{preamble-standalone.ltx} \begin{document} % Ex. No. 36 (Section 6.1.1 : Option \tkzname{ortho} or \tkzname{orthic}) \begin{tikzpicture} \tkzDefPoint(0,0){A} \tkzDefPoint(5,1){B} \tkzDefPoint(1,4){C} \tkzClipPolygon(A,B,C) \tkzDefTriangleCenter[ortho](B,C,A) \tkzGetPoint{H} \tkzDefSpcTriangle[orthic,name=H](A,B,C){a,b,c} \tkzDrawPolygon[color=blue](A,B,C) \tkzDrawPoints(A,B,C,H) \tkzDrawLines[add=0 and 1](A,Ha B,Hb C,Hc) \tkzLabelPoint(H){$H$} \tkzAutoLabelPoints[center=H](A,B,C) \tkzMarkRightAngles(A,Ha,B B,Hb,C C,Hc,A) \end{tikzpicture} \end{document}