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+%%
+%% An UIT Edition example
+%%
+%% Example 04-06-4 on page 82.
+%%
+%% Copyright (C) 2012 Vo\ss
+%%
+%% It may be distributed and/or modified under the conditions
+%% of the LaTeX Project Public License, either version 1.3
+%% of this license or (at your option) any later version.
+%%
+%% See http://www.latex-project.org/lppl.txt for details.
+%%
+
+% Show page(s) 2,8,10,16
+
+%% ====
+\PassOptionsToClass{dvips}{beamer}
+\documentclass{exabeamer}
+\usepackage[utf8]{inputenc}
+
+%\StartShownPreambleCommands
+\usepackage{pst-node} \psset{angleA=90,angleB=-90}
+\usepackage{amsmath} \usetheme{Malmoe} \usecolortheme{dove}
+%\StopShownPreambleCommands
+
+\begin{document}
+\begin{frame}{Right-angled triangle}
+\onslide<-6,8>{Pythagoras's theorem\ldots }
+\begin{align*} \onslide<8>{a^2+b^2 &= c^2}\\
+ \onslide<2->{\rnode{A}{\texttt{side}}^2} \onslide<3->{ + }
+ \onslide<4->{\rnode{B}{\texttt{side}}^2} \onslide<5->{ &= }
+ \onslide<6->{\rnode{C}{\texttt{hypotenuse}}^2} \end{align*}
+\onslide<7>{in words:}\par \onslide<8>{In a right-angled triangle,
+the square on the \rnode{h}{hypotenuse} is equal to
+the sum of the squares on the other two \rnode{k}{sides}!
+ \nccurve{->}{k}{A}\nccurve{->}{k}{B}\nccurve{->}{h}{C}}
+\end{frame}
+\begin{frame}{Right-angled triangle}
+\only<-6,8>{Pythagoras's theorem\ldots }
+\begin{align*} \only<8>{a^2+b^2 &= c^2}\\
+ \only<2->{\rnode{A}{\texttt{side}}^2} \only<3->{ + }
+ \only<4->{\rnode{B}{\texttt{side}}^2} \only<5->{ &= }
+ \only<6->{\rnode{C}{\texttt{hypotenuse}}^2} \end{align*}
+ \only<7>{in words:}\par \only<8>{In a right-angled triangle,
+the square on the \rnode{h}{hypotenuse} is equal to
+the sum of the squares on the other two \rnode{k}{sides}!
+ \nccurve{->}{k}{A}\nccurve{->}{k}{B}\nccurve{->}{h}{C}}
+\end{frame}
+\end{document}