LaTeX Forum

\documentclass[margin=10pt]{standalone} 
\usepackage{tikz} 
\begin{document} 
\begin{tikzpicture}[
  level distance=10mm,
  sibling distance=25mm,
  nodes={fill=red!60,circle,inner sep=1pt},
  level 1/.style={nodes={fill=red!45}},
  level 2/.style={nodes={fill=red!30}},
  %level 3/.style={nodes={fill=red!15}},% im Beispiel nicht verwendet
  ] 
\node(a){A} 
  child {node {B}} 
  child {node {C} 
    child {node {19}
  } 
} 
  child {node {D}}
;
\path(a-2-1)
  edge (a-1)
  edge (a-3)
;
\end{tikzpicture} 
\end{document}

\documentclass[12pt]{article} 
\usepackage[english,german]{babel} 
\usepackage[utf8]{inputenc}
\renewcommand{\rmdefault}{phv}
\renewcommand{\sfdefault}{phv} 
\usepackage{relsize}
\usepackage{amsmath}
\usepackage{caption}
\usepackage{graphicx} 
\usepackage[printonlyused]{acronym}
\usepackage[colorinlistoftodos]{todonotes}
\usepackage{url}
\usepackage{setspace}\onehalfspacing
\usepackage{geometry}
\usepackage{tikz}
\usetikzlibrary{positioning,shadings}
\usetikzlibrary{arrows}
\usetikzlibrary{mindmap,trees}
\usepackage{cite}
\usepackage{mathptmx} %Times
\geometry{a4paper, top=30mm, left=40mm, right=30mm, bottom=30mm, headsep=15mm, footskip=12mm} 
 

\begin{document} 

\begin{tikzpicture}[level distance=10mm]
\tikzstyle{every node}=[fill=red!60,circle,inner sep=1pt]
\tikzstyle{level 1}=[sibling distance=25mm,
set style={{every node}+=[fill=red!45]}]
\tikzstyle{level 2}=[sibling distance=25mm,
set style={{every node}+=[fill=red!30]}]
\tikzstyle{level 3}=[sibling distance=25mm,
set style={{every node}+=[fill=red!15]}]
\node {A}
child {node {B}
	child {node {19}}
}
child {node {C}
	child {node {19}}
}
child {node {D}
	child {node {19}}
};
\end{tikzpicture}

\end{document}