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@@ -0,0 +1,25 @@
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+\documentclass[varwidth=true, border=2pt]{standalone}
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+\usepackage{tkz-euclide}
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+
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+\begin{document}
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+\usetkzobj{all}
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+\begin{tikzpicture}
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+ \tkzSetUpPoint[shape=circle,size=10,color=black,fill=black]
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+ \tkzSetUpLine[line width=1]
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+ \tkzDefPoints{0/0/Q, 4/1/H1, 1/2/P}
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+ \tkzDefPoint(1.5,3){Phelper}
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+ \tkzMarkAngle[arc=l,size=1cm,color=green,fill=green!20](H1,Q,P)
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+ \tkzDrawLine(Q,H1)
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+
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+ \tkzLabelPoint[above left](Q){$Q$}
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+ \tkzDefLine[parallel=through P](Q,H1) \tkzGetPoint{b}
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+ \tkzMarkAngle[arc=l,size=1cm,color=green,fill=green!20](b,P,Phelper)
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+ \tkzDrawLine[dashed](P,b)
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+ \tkzLabelLine[pos=0.8,below](P,b){$f$}
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+ \tkzLabelLine[pos=0.8,below](Q,H1){$g$}
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+ \tkzLabelPoint[above left](P){$P$}
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+ \tkzDrawLine[add=0.2 and 0.7](Q,P)
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+ \tkzDrawPoints(P,Q)
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+ \tkzMarkSegments[mark=||](Q,H1 P,b)
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+\end{tikzpicture}
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+\end{document}
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