\begin{frame}
  \frametitle{Representations of Functions}

  Functions can be represented in four ways:
  \begin{itemize}
  \pause
    \item verbally (a description in words)\vspace{-1ex}
      \begin{minipage}{.9\textwidth}
      \begin{exampleblock}{}
        Example: $A(r)$ is the area of a circle with radius $r$.
      \end{exampleblock}
      \end{minipage}\medskip
      
  \pause
    \item numerically (a table of values)\vspace{-1ex}
      \begin{minipage}{.9\textwidth}
      \begin{exampleblock}{}
        {\small
        \begin{tabular}{|l|l|l|l|}
          \hline
          $r$ & $1$ & $2$ & $3$\\
          \hline
          $A(r)$ & $3.14159$ & $12.56637$ & $28.27433$\\
          \hline
        \end{tabular}
        }
      \end{exampleblock}
      \end{minipage}\medskip

  \pause
    \item visually (a graph)\vspace{-1ex}
      \begin{minipage}{.9\textwidth}
      \begin{exampleblock}{}
        \begin{center}
        \scalebox{.5}{
        \begin{tikzpicture}[default]
          \def\diax{r}
          \def\diay{A(r)}
          \diagram{-.5}{3}{-.5}{3}{1}
          \diagramannotatez
          \diagramannotatexx{1/1,2/2}
          \diagramannotateyy{1/10,2/20}
          \draw[cblue] plot[smooth,domain=0:3,samples=20] (\x,{.1*pi*\x^2});
        \end{tikzpicture}
        }
        \end{center}
      \end{exampleblock}
      \end{minipage}\medskip
      
  \pause
    \item algebraically (an explicit formula)\vspace{-1ex}
      \begin{minipage}{.9\textwidth}
      \begin{exampleblock}{}
        $A(r) = \pi r^2$
      \end{exampleblock}
      \end{minipage}
  \end{itemize}
  
\end{frame}