%% 
%%  Ein Beispiel der DANTE-Edition
%%  
%%  2. Auflage
%% 
%%  Beispiel 15-04-9 auf Seite 770.
%% 
%%  Copyright (C) 2016 Herbert Voss
%% 
%%  It may be distributed and/or modified under the conditions
%%  of the LaTeX Project Public License, either version 1.3
%%  of this license or (at your option) any later version.
%% 
%%  See http://www.latex-project.org/lppl.txt for details.
%% 
%% 
%% ==== 
% Show page(s) 1
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%% 
\documentclass[]{exaarticle}
\pagestyle{empty}
\setlength\textwidth{145.16928pt}
\usepackage[T1]{fontenc}
%StartShownPreambleCommands
\usepackage{tikz}
%StopShownPreambleCommands
\begin{document}
\begin{tikzpicture}
  \draw(1.2,0)--(0,0)--(1,1);
  \draw (0,0) circle (1cm);
  \draw [thick] (8mm,0mm) arc (0:45:8mm);
\end{tikzpicture}\\[4pt]
\begin{tikzpicture}[scale=1.5]
  \draw(1.2,0)--(0,0)--(1,1);
  \draw (0,0) circle (1cm);
  \draw [thick] (8mm,0mm) arc (0:45:8mm);
\end{tikzpicture}\\[4pt]
\tikz{\filldraw[red!40](0,0)
        arc (0:315:1.7cm and 1cm)
           -- (-1,0) -- cycle;
      \draw[->](-1,0)--(1,0);
      \draw[->](0,-1)--(0,1);
      \filldraw[black](-1.7,0) circle (1.5pt);}
\end{document}