PGF/TikZ Manual

The TikZ and PGF Packages
Manual for version 3.1.9a

Part III TikZ ist kein Zeichenprogramm

by Till Tantau

(-tikz- diagram)

\usetikzlibrary {angles,calc,quotes}
\begin{tikzpicture}[angle radius=.75cm]

  \node(A)at (-2,0)     [red,left]   {$A$};
  \node(B)at ( 3,.5)    [red,right]  {$B$};
  \node(C)at (-2,2)     [blue,left]  {$C$};
  \node(D)at ( 3,2.5)   [blue,right] {$D$};
  \node(E)at (60:-5mm)  [below]      {$E$};
  \node(F)at (60:3.5cm) [above]      {$F$};

  \coordinate(X)at (intersection cs:first line={(A)--(B)}, second line={(E)--(F)});
  \coordinate(Y)at (intersection cs:first line={(C)--(D)}, second line={(E)--(F)});

  \path
    (A)edge [red, thick]  (B)
    (C)edge [blue, thick] (D)
    (E)edge [thick]       (F)
      pic ["$\alpha$", draw, fill=yellow]   {angle = F--X--A}
      pic ["$\beta$",  draw, fill=green!30] {angle = B--X--F}
      pic ["$\gamma$", draw, fill=yellow]   {angle = E--Y--D}
      pic ["$\delta$", draw, fill=green!30] {angle = C--Y--E};

  \nodeat ($ (D)!.5!(B)$) [right=1cm,text width=6cm,rounded corners,fill=red!20,inner sep=1ex]
    {
      When we assume that $\color{red}AB$ and $\color{blue}CD$ are
      parallel, i.\,e., ${\color{red}AB} \mathbin{\|} \color{blue}CD$,
      then $\alpha= \gamma$ and $\beta= \delta$.
    };
\end{tikzpicture}