\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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\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=-2.9403465848187165,
ymax=5.384562951449073,
xtick={0,1,...,8},
ytick={-2,-1,...,5},]
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\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] (8.360901861615332,0.9546412102623979) circle (2.5pt);
\draw[color=ududff] (8.294035118352138,1.3140499553020717) node {$C$};
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\draw[color=zzttqq] (6.555499793509075,2.484217962407986) node {$a$};
\draw[color=zzttqq] (5.234881614060978,1.4477834418284619) node {$b$};
\draw[color=qqwuqq] (2.7440954275069727,1.0131496106176936) node {$\alpha = 314.59\textrm{\degre}$};
\draw[color=qqwuqq] (8.962702550984087,1.1803164687756813) node {$\beta = 41.77\textrm{\degre}$};
\draw[color=qqwuqq] (5.9536991041403216,3.821552827671888) node {$\gamma = 92.82\textrm{\degre}$};
\end{scriptsize}
\end{axis}
\end{tikzpicture}
\end{document}