Placing Nodes Around a Circle

Question

I want to draw e.g. 9,13,17 nodes, evenly, around a circle in TikZ. How do I do this?

Then I also want to be able to edit easily the edges between the different nodes (to represent different graphs on those nodes).

Answer 1

A very simple approach using polar coordinates. Change the value of \n to adjust the number of circles. The nodes are named was n-<number>

\documentclass{article}
\usepackage{tikz}

\begin{document}

\begin{tikzpicture}[scale=3]
\pgfmathsetmacro\n{9}
\draw(0,0) circle (1);
\foreach \i in {0,...,\n} {
    \pgfmathsetmacro\r{\i*(360/\n)}
    \node (n-\i) at (\r:1) {A};
}
\end{tikzpicture}

\end{document}

---

More complex example:

\documentclass{article}
\usepackage{tikz}

\begin{document}

\begin{tikzpicture}[scale=3]
\draw(0,0) circle (1);
\pgfmathsetmacro\n{6}
\foreach \i/\k in {0/A,1/B,2/C,3/X,4/Y,5/Z} {
    \pgfmathsetmacro\r{\i*(360/\n)}
    \fill (\r:1) circle (1pt) coordinate (n-\i);
    \node at (\r:1.2) {\k};
}
\draw (n-0) -- (n-3);
\draw (n-0) -- (n-5);
\draw (n-0) -- (n-2);
\end{tikzpicture}

\end{document}