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Μια ιδιοτητα της υπερβολης γεωμετρικα αποδειγμενη
H εφαπτομενη και καθετος της σε τυχον σημειο υπερβολης διχοτομουν τις γωνιες των εστιακων
αποστασεων
ΣΡ διχοτομει την γωνια ΕΡΕ_1
ΡΓ διχοτομει την γωνια ΕΡΑ