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+\documentclass{article}
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+\usepackage[pdftex,active,tightpage]{preview}
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+\setlength\PreviewBorder{2mm}
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+\usepackage{tikz}
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+\usepackage{tkz-euclide}
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+\usetkzobj{all}
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+\usetikzlibrary{shapes, calc, decorations}
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+\usepackage{amsmath,amssymb}
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+\usepackage{helvet}
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+\usepackage[eulergreek]{sansmath}
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+
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+\begin{document}
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+\begin{preview}
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+\begin{tikzpicture}[very thick,font=\sansmath\sffamily,scale=2]
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+ \newcommand\anglePoint{40}
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+ \tkzDefPoint(0,0){O}
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+ \tkzDefPoint(1,0){D}
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+ \tkzDefPoint(0,1){E}
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+ \tkzDefPoint(1,1){up}
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+ \tkzDefPoint({cos(\anglePoint * 0.0174533),0}){C}
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+ \tkzDefPoint(0,{sin(\anglePoint * 0.0174533)}){S}
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+ \tkzDefPoint(\anglePoint:1){P}
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+
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+ % Axes
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+ \draw[gray] (O) circle (1);
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+ \node[gray,below right] at (1,0) {1};
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+ \node[blue,left] at (\anglePoint/2:1) {b};
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+ \node[gray,above right] at (0,1) {1};
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+ \node[gray,below right] at (-1,0) {-1};
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+ \node[gray,above right] at (0,-1) {-1};
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+ \draw[gray,->] (-1.2, 0) -- (1.2,0);
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+ \draw[gray,->] (0,-1.2) -- (0,1.2);
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+
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+ % \node[circle,fill=black,inner sep=0pt,minimum size=3pt,label=left:{$C_1$}] (C1) at (0,0) {};
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+ \tkzLabelPoints[below right,font=\sansmath\sffamily](O)
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+ \tkzLabelPoints[above right,font=\sansmath\sffamily](D)
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+ \tkzLabelPoints[above left,font=\sansmath\sffamily](E)
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+ \tkzLabelPoints[above,font=\sansmath\sffamily](P)
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+ \tkzLabelPoints[below,font=\sansmath\sffamily](C)
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+ \tkzLabelPoints[left,font=\sansmath\sffamily](S)
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+
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+ \draw[red] (0,0) -- (\anglePoint:1);
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+
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+ \tkzInterLL(O,P)(E,up)
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+ \tkzGetPoint{K}
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+ \tkzInterLL(O,P)(D,up)
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+ \tkzGetPoint{T}
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+
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+ \tkzLabelPoints[below right,font=\sansmath\sffamily](T)
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+ \tkzLabelPoints[below right,font=\sansmath\sffamily](K)
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+ \draw (S) -- (P);
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+ \draw (C) -- (P);
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+ \draw (E) -- (K);
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+ \draw (D) -- (T);
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+ \draw ({\anglePoint+180}:1.2) -- (\anglePoint:1.8);
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+ \tkzMarkAngle[color=blue,arc=l,size=1cm,line width=1.5pt](D,O,P)
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+ \tkzDrawPoints[size=2,fill=black](C, D, E, S, T, K, P)
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+
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+
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+ % \tkzLabelPoints[below right,font=\sansmath\sffamily](B)
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+ % \tkzLabelPoints[above,font=\sansmath\sffamily](C)
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+
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+ % % Draw polygon
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+ % \tkzDrawPolygon[thick,fill=gray!10](A,B,C)
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+
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+ % % Mark angles
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+ % \tkzMarkAngle[arc=l,size=0.6cm,fill=red!30](B,A,C)
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+ % \tkzLabelAngle[pos=0.3](B,A,C){$\alpha$}
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+
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+ % \tkzMarkAngle[arc=l,size=0.6cm,fill=blue!30](C,B,A)
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+ % \tkzLabelAngle[pos=0.4](C,B,A){$\beta$}
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+
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+ % \tkzMarkAngle[arc=l,size=0.6cm,fill=blue!30](A,C,B)
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+ % \tkzLabelAngle[pos=0.4](A,C,B){$\gamma$}
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+
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+ % % Label lines
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+ % \tkzLabelSegment[below](A,B){$c$}
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+ % \tkzLabelSegment[left](A,C){$b$}
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+ % \tkzLabelSegment[right](B,C){$a$}
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+
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+ % % Draw polygon
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+ % \tkzDrawPolygon[thick](A,B,C)
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+
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+ % \tkzDrawSegments[very thick,red](A,B A,C)
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+\end{tikzpicture}
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+\end{preview}
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+\end{document}
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