waferdiameter.tex

% I used that drawing for an email to a client. Shows a small example of using
% the 'calc' library of TikZ

\documentclass{scrartcl}
\usepackage{tikz}
	\usetikzlibrary{calc}
\usepackage{siunitx}
	\DeclareSIUnit\inch{in}
\usepackage[active,tightpage]{preview}
\PreviewEnvironment{tikzpicture}
\begin{document}
\begin{tikzpicture}[ultra thick]
	\draw [fill=lightgray] (0,0) circle (8);
	\newcommand\Square[1]{+(-#1,-#1) rectangle +(#1,#1)} % hat tip to http://tex.stackexchange.com/a/58930/828
	\draw [fill=white!60!black,draw=black] (0,0) \Square{{4*sqrt(2)}};
	\def\angle{60}
	\draw [<->,rotate=\angle] (0,0) -- (0,8) node [midway,above,sloped,rotate=\angle+180] {\(r_{w}=\SI{4}{\inch}=\SI{10.16}{\centi\meter}\)};
	\def\sidelength{5.66}
	\def\height{-4*0.68}
	\draw [<->] (-\sidelength,\height) -- (\sidelength,\height) node [midway, above] {\(l_{sq}=r_{w}\sqrt{2}=\SI{\sidelength}{\inch}=\SI{14.37}{\centi\meter}\)};
\end{tikzpicture}
\end{document}