%% 
%%  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}