This example is from the Part III title page of the TikZ and PGF manual.
Author: Till Tantau Source: The PGF/TikZ manual
Edit and compile if you like:
% Author: Till Tantau% Source: The PGF/TikZ manual\documentclass{article}\usepackage{tikz}\begin{document}\pagestyle{empty}\begin{tikzpicture}\draw[fill=yellow] (0,0) -- (60:.75cm) arc (60:180:.75cm);\draw(120:0.4cm) node {$\alpha$};\draw[fill=green!30] (0,0) -- (right:.75cm) arc (0:60:.75cm);\draw(30:0.5cm) node {$\beta$};\begin{scope}[shift={(60:2cm)}]\draw[fill=green!30] (0,0) -- (180:.75cm) arc (180:240:.75cm);\draw (30:-0.5cm) node {$\gamma$};\draw[fill=yellow] (0,0) -- (240:.75cm) arc (240:360:.75cm);\draw (-60:0.4cm) node {$\delta$};\end{scope}\begin{scope}[thick]\draw (60:-1cm) node[fill=white] {$E$} -- (60:3cm) node[fill=white] {$F$};\draw[red] (-2,0) node[left] {$A$} -- (3,0)node[right]{$B$};\draw[blue,shift={(60:2cm)}] (-3,0) node[left] {$C$} -- (2,0)node[right]{$D$};\draw[shift={(60:1cm)},xshift=4cm]node [right,text width=6cm,rounded corners,fill=red!20,inner sep=1ex]{When we assume that $\color{red}AB$ and $\color{blue}CD$ areparallel, i.\,e., ${\color{red}AB} \mathbin{\|} \color{blue}CD$,then $\alpha = \delta$ and $\beta = \gamma$.};\end{scope}\end{tikzpicture}
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