Sorry for such an elementary question, but all the examples I could find in search were too complicated.

I'm trying to recreate a circular drop shadow example from the pgf manual. What packages are necessary and where do I place

shadow scale=1.1, shadow xshift=.3ex, shadow yshift=-.3ex,
fill=black, path fading={circle with fuzzy edge 15 percent},


in regards to the rest of the code?

\documentclass{standalone}
\usepackage{tikz}
\usetikzlibrary{shapes.geometric}
\usepgflibrary{decorations.shapes}
\begin{document}
\begin{tikzpicture} {1,...,8}
at (\i*45:1) {Circle \i};
\end{tikzpicture}
\end{document}

-
The needed library is shadows. The thing you want to place is the default setting. (Though, you can adjust the shadow if you use options like circular drop shadow={<options>}.) Note that you missed \foreach in while copying the example from the manual (which is to prepended to the {1,...,8}). – Qrrbrbirlbel Apr 16 '13 at 22:11

For the example you need the shadows library; I added the \foreach line that you missed in your code:

\documentclass{standalone}
\usepackage{tikz}

\begin{document}

\begin{tikzpicture}
\foreach \i in {1,...,8}
at (\i*45:1) {Circle \i};
\end{tikzpicture}

\end{document}


The lines

shadow scale=1.1, shadow xshift=.3ex, shadow yshift=-.3ex,
fill=black, path fading={circle with fuzzy edge 15 percent},


are the default options for this kind of shadow, which you can change using circular drop shadow={<options>}. If you want to modify the path fading, you will also need the fadings library :

\documentclass{standalone}
\usepackage{tikz}

\begin{document}

\begin{tikzpicture}
\foreach \i in {1,...,8}
{