I have one pie chart and there is just one area, i.e. the whole pie is just one slice.
This looks like this:
\begin{tikzpicture}
\pie[radius = 1,
color = {gray}, sum=auto]{1/}
\end{tikzpicture}
However, I want to change two things: (1) I want to remove the line within the pie chart. (2) I want to center the number, so that it is displayed exactly in the center of the pie. This would look as follows:
Any ideas how to archive that? Thank you!

