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%
% dreieck3d4.tex
%
% (c) 2021 Prof Dr Andreas Müller, OST Ostschweizer Fachhochschule
%
\documentclass[tikz]{standalone}
\usepackage{times}
\usepackage{amsmath}
\usepackage{txfonts}
\usepackage[utf8]{inputenc}
\usepackage{graphics}
\usetikzlibrary{arrows,intersections,math}
\usepackage{ifthen}
\begin{document}
\newboolean{showgrid}
\setboolean{showgrid}{false}
\def\breite{4}
\def\hoehe{4}
\begin{tikzpicture}[>=latex,thick]
% Povray Bild
\node at (0,0) {\includegraphics[width=8cm]{dreieck3d4.jpg}};
% Gitter
\ifthenelse{\boolean{showgrid}}{
\draw[step=0.1,line width=0.1pt] (-\breite,-\hoehe) grid (\breite, \hoehe);
\draw[step=0.5,line width=0.4pt] (-\breite,-\hoehe) grid (\breite, \hoehe);
\draw (-\breite,-\hoehe) grid (\breite, \hoehe);
\fill (0,0) circle[radius=0.05];
}{}
\node at (0.7,3.8) {$A$};
\node at (-3.4,-0.8) {$B$};
\node at (3.3,-2.1) {$C$};
\node at (-1.4,-3.5) {$P$};
%\node at (-1.9,2.1) {$c$};
\node at (-0.2,-1.2) {$a$};
%\node at (2.6,1.5) {$b$};
\node at (-2.6,-2.2) {$p_b$};
\node at (1,-2.9) {$p_c$};
%\node at (0.7,3) {$\alpha$};
%\node at (-2.5,-0.5) {$\beta$};
%\node at (2.3,-1.2) {$\gamma$};
\node at (-2.3,-1.5) {$\beta_1$};
\end{tikzpicture}
\end{document}
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