File:Sinussatz.svg

\documentclass[]{book}%{IEEEtran}
\usepackage{graphicx}
\usepackage{epstopdf}
\usepackage{tikz}
\begin{document}
\begin{tikzpicture}
\fill[fill=blue!10!white] (0,0) -- (1,0)  arc (0:45:1);
\fill[fill=green!10!white] (5,5) --(5.5,4.134) arc (-40:-132:1);
\fill[fill=red!10!white] (8,0) --(7.5,0.866) arc (120.0000:180:1);
\draw[blue,thick] (1,0)  arc (0:45:1);
\draw[red,thick] (7.5,0.866) arc (120.0007:180:1);
\node[blue] at (0.6,0.2) {$\alpha$};
\node[green] at (4.8,4.2) {$\beta$};
\node[red] at (7.4,0.4) {$\gamma$};
\draw[green,thick] (5.5,4.134) arc (-40:-132:1);
\draw[red,thick] (0,0) -- (5,5);
\draw[blue,thick] (5,5) -- (8,0);
\draw[green,thick] (0,0) -- (8,0);
\node[red] at (2.2,3) {$c$};
\node[green] at (4.4,-0.4) {$b$};
\node[blue] at (7,3.2) {$a$};
\node at (0.8,4) {${\color{blue}\frac{a}{\sin(\alpha)}}={\color{green}\frac{b}{\sin(\beta)}}={\color{red}\frac{c}{\sin(\gamma)}}$};
\end{tikzpicture}
\end{document}