Graphics, Figures & Tables ⇒ tikz pie chart

[colas]

Code: Select all

\documentclass{article}
\usepackage[paperheight=30cm,paperwidth=35cm,margin=1in,heightrounded]{geometry}
\usepackage{tikz}
\usetikzlibrary{calc}

How to divide the pie in unequal slices ?
Thanks

Code: Select all

\begin{document}
\thispagestyle{empty}
\fbox{\begin{tikzpicture}[scale=0.6] 
% center
\path  (0,0) coordinate(A);

% circles
\foreach \rr in {12,...,24}{
  \draw  (A) circle (\rr);
}

\def\pp{25} 
% rays
\foreach \aa in {1,...,\pp}{
  \draw ($(A)+(\aa/\pp*360:12)$) --  ($(A)+(\aa/\pp*360:24)$); 
}
\end{tikzpicture}}

\end{document}