Consider the following simple tikz picture
\begin{tikzpicture}
\tikz \draw (1,0) node{$\pi$} circle (1);
\end{tikzpicture}
I want to scale (increase the size) of the pi, but not of the circle itself.
I already tried to use a scalebox, but the resulting text wasn't placed inside the circle. I also tried
\begin{tikzpicture}
\tikz \draw (1,0) node{\large $\pi$} circle (1);
\end{tikzpicture}
and
\begin{tikzpicture}
\tikz \draw (1,0) node[font=\large]{$\pi$} circle (1);
\end{tikzpicture}
but both result in the error "TeX capacity exceeded, sorry [input stack size=5000]."
Can you tell me if there is a way to properly increase the font size for math mode inside tikz pictures?