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Μια ιδιοτητα εφαπτομενων παραβολης
πρ.π.6 Οι εφαπτομενες στα ακρα εστιακης χορδης τεμνοται πανω στη διευθετουσα και σχηματιζουν μεταξυ τους ορθη γωνια