\documentclass[10pt]{article}
\usepackage{pgfplots}
\pgfplotsset{compat=1.15}
\usepackage{mathrsfs}
\usetikzlibrary{arrows}
\pagestyle{empty}
\begin{document}
\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=-6.200000000000001,
xmax=11.200000000000005,
ymin=-5.889999999999999,
ymax=4.49,
xtick={-6,-5,...,11},
ytick={-5,-4,...,4},]
\clip(-6.2,-5.89) rectangle (11.2,4.49);
\fill[line width=2pt,color=zzttqq,fill=zzttqq,fill opacity=0.10000000149011612] (4.68,1.79) -- (6.28,1.85) -- (6.76,2.37) -- cycle;
\draw [line width=2pt,color=zzttqq] (4.68,1.79)-- (6.28,1.85);
\draw [line width=2pt,color=zzttqq] (6.28,1.85)-- (6.76,2.37);
\draw [line width=2pt,color=zzttqq] (6.76,2.37)-- (4.68,1.79);
\begin{scriptsize}
\draw [fill=ududff] (4.68,1.79) circle (2.5pt);
\draw[color=ududff] (4.84,2.22) node {$A$};
\draw [fill=ududff] (6.28,1.85) circle (2.5pt);
\draw[color=ududff] (6.44,2.28) node {$B$};
\draw [fill=ududff] (6.76,2.37) circle (2.5pt);
\draw[color=ududff] (6.92,2.8) node {$C$};
\draw[color=zzttqq] (5.56,1.74) node {$c$};
\draw[color=zzttqq] (6.82,2.14) node {$a$};
\draw[color=zzttqq] (5.7,2.62) node {$b$};
\end{scriptsize}
\end{axis}
\end{tikzpicture}
\end{document}
