\documentclass[10pt]{article}
\usepackage{pgfplots}
\pgfplotsset{compat=1.15}
\usepackage{mathrsfs}
\usetikzlibrary{arrows}
\pagestyle{empty}
\newcommand{\degre}{\ensuremath{^\circ}}
\begin{document}
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\definecolor{zzttqq}{rgb}{0.6,0.2,0}
\definecolor{ududff}{rgb}{0.30196078431372547,0.30196078431372547,1}
\begin{tikzpicture}[line cap=round,line join=round,>=triangle 45,x=1cm,y=1cm]
\begin{axis}[
x=1cm,y=1cm,
axis lines=middle,
ymajorgrids=true,
xmajorgrids=true,
xmin=-0.2314746477051945,
xmax=8.477918662325923,
ymin=-2.9236298990029175,
ymax=5.384562951449073,
xtick={0,1,...,8},
ytick={-2,-1,...,5},]
\clip(-0.2314746477051945,-2.9236298990029175) rectangle (8.477918662325923,5.384562951449073);
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\draw [shift={(2,1)},line width=2pt,color=qqwuqq,fill=qqwuqq,fill opacity=0.10000000149011612] (0,0) -- (-315:0.5015005744739607) arc (-315:0:0.5015005744739607) -- cycle;
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\draw [line width=2pt,color=zzttqq] (5,4)-- (6,1);
\draw [line width=2pt,color=zzttqq] (6,1)-- (2,1);
\begin{scriptsize}
\draw [fill=ududff] (2,1) circle (2.5pt);
\draw[color=ududff] (2.1255780523224206,1.364200012749468) node {$A$};
\draw [fill=ududff] (5,4) circle (2.5pt);
\draw[color=ududff] (5.134581499166186,4.356486773777448) node {$B$};
\draw [fill=ududff] (6,1) circle (2.5pt);
\draw[color=ududff] (6.137582648114107,1.364200012749468) node {$C$};
\draw[color=zzttqq] (3.7470965764548936,2.5176513340395834) node {$c$};
\draw[color=zzttqq] (5.301748357324173,2.617951448934376) node {$a$};
\draw[color=zzttqq] (4.064713606955069,1.4645001276442606) node {$b$};
\draw[color=qqwuqq] (2.5434951977173883,0.9964329248018948) node {$\alpha = 315\textrm{\degre}$};
\draw[color=qqwuqq] (6.639083222588067,1.297333269486273) node {$\beta = 71.57\textrm{\degre}$};
\draw[color=qqwuqq] (5.870115675061328,3.821552827671888) node {$\gamma = 63.43\textrm{\degre}$};
\end{scriptsize}
\end{axis}
\end{tikzpicture}
\end{document}
