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\input{preamble-standalone.ltx}
\begin{document}
% Ex. No. 42 (Section 9.3.1 : Example of projection)
\begin{tikzpicture}[scale=1.5]
\tkzInit[xmin=-3,xmax=5,ymax=4] \tkzClip[space=.5]
\tkzDefPoint(0,0){A}
\tkzDefPoint(0,4){B}
\tkzDrawTriangle[pythagore](B,A) \tkzGetPoint{C}
\tkzDefLine[bisector](B,C,A) \tkzGetPoint{c}
\tkzInterLL(C,c)(A,B) \tkzGetPoint{D}
\tkzDrawSegment(C,D)
\tkzDrawCircle(D,A)
\tkzDefPointBy[projection=onto B--C](D) \tkzGetPoint{G}
\tkzInterLC(C,D)(D,A) \tkzGetPoints{E}{F}
\tkzDrawPoints(A,C,F) \tkzLabelPoints(A,C,F)
\tkzDrawPoints(B,D,E,G)
\tkzLabelPoints[above right](B,D,E,G)
\end{tikzpicture}
\end{document}
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