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Teorema Tutte le perpendicolari ad una retta r in un punto Q giacciono su un medesimo piano
Vogliamo dimostrare il teorema: [i]Tutte le perpendicolari ad una retta r in un suo punto Q giacciono su uno stesso piano [math]\pi[/math][/i][br][br]Per fare questo occorre dimostrare prima un risultato preliminare (lemma).