Text, Formulas, Colors

\definecolor{hellgrau}{gray}{.8}
\definecolor{dunkelblau}{rgb}{0, 0, .7}
\definecolor{roetlich}{rgb}{1, .7, .7}
\definecolor{dunkelmagenta}{rgb}{.3, 0, .3}

\setlength{\unitlength}{1cm}
\begin{picture}(6, 8)
  \linethickness{0.075mm}
  \multiput(0, 0)(6, 0){2}{\line(0, 1){8}}
  \multiput(0, 0)(0, 8){2}{\line(1, 0){6}}
  \thicklines
  \color{dunkelmagenta}
  \put(1, .5){\line(2, 1){3}}
  \put(4, 2){\line(-2, 1){2}}
  \put(2, 3){\line(-2, -5){1}}
  \put(.7, .3){$A$} 
  \put(4.05, 1.9){$B$}
  \put(1.7, 2.95){$C$}
  \put(3.1, 2.5){$a$}
  \put(1.3, 1.7){$b$}
  \put(2.5, 1.05){$c$}
  \color{dunkelblau}
  \put(0.3, 4){$F=\sqrt{s(s-a)(s-b)(s-c)}$}
  \put(3.5, 0.4){$\displaystyle 
    s:=\frac{a+b+c}{2}$}
  \put(0.5, 7.3){The {\textcolor{red}{\texttt{%
                 color}}} package allows the} 
  \put(0.5, 6.7){use of \fcolorbox{dunkelblau}%
                 {roetlich}{colors} \colorbox%
		 {hellgrau}{inside} and} 
  \put(0.5, 6.1){\colorbox{hellgrau}{outside} 
                 of \textcolor{red}{\texttt{%
                 picture}}} 
  \put(0.5, 5.6){environments.}
\end{picture}