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\begin{tikzpicture}[scale=1.25]
\tkzInit[xmin=0,xmax=4,ymin=0,ymax=3] \tkzClip
\tkzDefPoint(0,0){A} \tkzDefPoint(4,0){B}
\tkzDefPoint(1,3){C} \tkzDrawPolygon(A,B,C)
\tkzSetUpLine[color=magenta]
\tkzDrawLine[altitude](B,C,A)
\tkzDrawLine[altitude](C,A,B)
\tkzDrawLine[altitude](A,B,C)
\end{tikzpicture}
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