Code:
\documentclass[a4paper,11pt]{scrreprt}
\usepackage[utf8]{inputenc}
\usepackage[german,germanb]{babel}
\usepackage[T1]{fontenc}
\usepackage{textcomp}
\usepackage{graphicx}
\usepackage{tikz}
\usepackage{footmisc}
\begin{document}
\begin{tikzpicture}[scale=5]
\clip (5.8,4.2) rectangle (7.2,5.7);
\draw[step=.5cm,gray,very thin] (6,4.5) grid (14,12);
\draw[->] (6,4.5) -- (14.5,4.5);
\draw[->] (6,4.5) -- (6,12.5);
\foreach \x in {0,0.5,...,14}
\draw (\x cm,4.5cm+1pt) -- (\x cm,4.5cm-1pt) node[anchor=north] {$\x$};
\foreach \y in {0,0.5,...,12}
\draw (6cm+1pt,\y cm) -- (6cm-1pt,\y cm) node[anchor=east] {$\y$};
%\draw[step=.5cm,gray,very thin] (0,0) grid (14,12);
\draw[->] (0,0) -- (14.5,0);
\draw[->] (0,0) -- (0,12.5);
\draw[red] (3,3) circle (4cm);
\coordinate (X) at (6.5,5);
\coordinate [label=left:$A$] (A) at (3,3);
\draw[green] (10.5,2.5) circle (4.7cm);
\coordinate [label=right:$B$] (B) at (10.5,2.5);
\draw[blue] (8.5,8) circle (3.6cm);
\coordinate [label=above:$C$] (C) at (8.5,8);
\fill[gray] (A) circle (1.5pt);
\fill[gray] (B) circle (1.5pt);
\fill[gray] (C) circle (1.5pt);
\foreach \x in {0,1,2,...,14}
\draw (\x cm,1pt) -- (\x cm,-1pt) node[anchor=north] {$\x$};
\foreach \y in {0,1,2,...,12}
\draw (1pt,\y cm) -- (-1pt,\y cm) node[anchor=east] {$\y$};
\end{tikzpicture}
\end{document}
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