Pappus Alexandrinus
,
Mathematical Collection, Book 8
,
1876
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κύκλος ὁ ΗΖΛ ἴσος τῷ μεγίστῳ τῷ ΑΒΓ περὶ διάμετρον
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τὴν ΖΗ, καὶ προσκείσθω ἡ ΗΚ ἴση τῇ ΓΘ, καὶ τῇ ὑπὸ
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ΑΘΔ γωνίᾳ ἴση συνεστάτω ἡ ὑπὸ ΖΚΜ, καὶ ἀπὸ τοῦ Ο
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κέντρου κάθετος ἡ ΟΛΜ, καὶ τῇ μὲν ΗΛ περιφερείᾳ ἴση
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ἀπειλήφθω ἡ ΓΒ, τῇ δὲ ΚΜ εὐθείᾳ ἡ ΘΔ· ἡ ΔΒ ἄρα
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ἴση ἐστὶν τῇ ΜΛ καὶ κάθετός ἐστιν ἐπὶ τὴν ΔΘ καὶ ἐκ-
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βαλλομένη ἐπὶ τὸ Ε κέντρον πίπτει· ταῦτα γὰρ δῆλα ἐκ
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τῆς ὁμοιότητος. </
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">ἤχθω δὴ τῇ ΔΘ πρὸς ὀρθὰς ἐν τῷ ὑπο-
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κειμένῳ ἐπιπέδῳ ἡ ΔΙ· ἡ ΔΘ ἄρα ὀρθὴ πρὸς τὸ διὰ τῶν
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Ε Δ Ι ἐπίπεδον, ὥστε καὶ ὁ ΑΒΓ κύκλος ὀρθὸς πρὸς τὸ
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διὰ τῶν Ε Δ Ι ἐπίπεδον· ἐκβληθὲν ἄρα τὸ διὰ τῶν Ε Δ Ι
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ἐπίπεδον κύκλον ποιήσει ἐν τῇ σφαίρᾳ μέγιστον ὀρθὸν
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πρὸς τὸν ΑΒΓ διὰ τῶν πόλων αὐτοῦ πίπτοντα καὶ διὰ
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τῶν Β Ο σημείων, ὥστε, ἐὰν τοῦ ΑΒΓ τὸν πόλον λαβόντες
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τὸν Π διὰ τοῦ Π καὶ ἑκατέρου τῶν Β Ο γράψωμεν κύ-
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