<reponame>trim1962/formulario
\documentclass[10pt]{standalone}
\usepackage{amsmath}
\usepackage{pgf,tikz}
\usepackage{mathrsfs}
\usetikzlibrary{arrows}
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\begin{document}
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\begin{scriptsize}
\draw [fill=black] (0.,0.) circle (2.5pt);
\draw[color=black] (0.14,0.29) node {$O$};
\draw [fill=black] (2.92,0.) circle (2.5pt);
\draw[color=black] (3.06,0.37) node {$B$};
\draw [fill=black] (-2.266252880339495,-1.84133046527584) circle (2.5pt);
\draw[color=black] (-2.68,-1.67) node {$C$};
\draw [fill=black] (-1.689504537051402,2.3815907329519757) circle (2.5pt);
\draw[color=black] (-1.54,2.75) node {$A$};
\draw[color=black] (0.96,1.45) node {$c$};
\draw[color=black] (0.84,-1.03) node {$a$};
\draw[color=black] (-2.24,0.49) node {$b$};
\draw[color=black] (-1.28,-0.49) node {$R$};
\draw[color=black] (-1.24,1.80) node {$\alpha$};
\draw[color=black] (2.1,0.11) node {$\beta$};
\draw[color=black] (-1.8,-1.3) node {$\gamma$};
\end{scriptsize}
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\end{document}