\documentclass{article} \usepackage[pdftex,active,tightpage]{preview} \usepackage{tikz} \PreviewEnvironment{tikzpicture} \begin{document} %%%%%%%%%%%%%%%%%%%%%%%%%%%%% \begin{tikzpicture} \draw (0,0) circle (1); \draw [fill=lightgray] (0,0) circle (0.75); \draw [fill=gray] (0,0) circle (0.5); %\draw [fill=darkgray] (0,0) circle (0.25); %\draw [ultra thick,red] (0,0) circle (0.025); \draw [red,thick,->] (0,0) -- (1,0) node at (1,0) [black,right] {1}; \draw [red,thick,->] (0,0) -- (0,0.75) node at (0,1) [black,above] {0.75}; %\draw [red,thick,->] (0,0) -- (-0.5,0) node at (-1,0) [black,left] {0.5}; %\draw [red,thick,->] (0,0) -- (0,-0.25) node at (0,-1) [black,below] {0.25}; \end{tikzpicture} %%%%%%%%%%%%%%%%%%%%%%%%%%%%%% \end{document}