[closed] TikZ: Whitespace verhindern

\documentclass[margin=5mm, tikz]{standalone}
\usepackage{tikz}
\usetikzlibrary{calc}
\usetikzlibrary{intersections}

\begin{document}

\pgfmathsetmacro{\m}{2} % 
\pgfmathsetmacro{\a}{\m*2.1} % 
\pgfmathsetmacro{\b}{\m*2.5} % 
\pgfmathsetmacro{\c}{\m*sqrt((\a^2+\b^2)/5)} %

\pgfdeclarelayer{background}
\pgfdeclarelayer{foreground}
\pgfsetlayers{background,main,foreground}
\begin{tikzpicture}[font=\footnotesize,
background rectangle/.style={draw=none, fill=black!1, rounded corners}, show background rectangle,
Punkt/.style 2 args={  label={[#1]:$#2$}   },  
]

% Koordinaten I
\begin{pgfonlayer}{foreground}
\coordinate[Punkt={below}{A}] (A) at (0,0); 
\coordinate[Punkt={below}{B}] (B) at (\c,0); 
\end{pgfonlayer}

\path[name path=kreisA] (A) circle[radius=\b];
\path[name path=kreisB, draw=none] (B) circle[radius=\a];

\path[name intersections={of=kreisA and kreisB, name=C}] ;

\draw (A) -- (B) -- (C-1) coordinate[Punkt={above}{C}] (C)--cycle;

% zum Anzeigen
\path[name path=kreisB, draw=red] (B) circle[radius=\a] node[red] {erzeugt Whitespace};

%% Strecken
%\begin{scope}[anchor=north]
%\foreach[count=\y from 0] \x in {a,b,c}
%\draw[|-|, yshift=-\y cm, transform canvas={shift=(A|-C), xshift=-\c cm}] (0,0) -- (\csname \x \endcsname,0) node[midway, above]{$\x$};
%\end{scope}
%
%
%% Punkte
%\foreach \P in {}
%\draw[fill=black!1] (\P) circle (1.5pt);

\end{tikzpicture}

\end{document}