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\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}
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