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Dôkaz kolmých priamok na priamku AB
\( \begin{array}{l}A B \perp B G \\ A B \perp E H\end{array} \)
\( \begin{array}{l}A B \perp B H \\ A B \perp E G\end{array} \)
\( \begin{array}{l}A B \parallel B E \\ A B \parallel G H\end{array} \)
\( \begin{array}{l}A B \parallel B G \\ A B \parallel E H\end{array} \)