Add $a$ squared to $b$ squared to get $c$ squared, i.e.,
    $a^2 + b^2 = c^2$. | 
    Add $a$ squared to $b$ squared to get $c$ squared, i.e.,
    $$ a^2 + b^2 = c^2, $$
    in (Plain) TeX.
     | 
    Add $a$ squared to $b$ squared to get $c$ squared, i.e.,
    \begin{displaymath} 
      a^2 + b^2 = c^2,
    \end{displaymath} 
    or \[ \], or
    \begin{equation} 
      a^2 + b^2 = c^2.
    \end{equation} 
     | 
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