Pappus Alexandrinus
,
Mathematical Collection, Book 8
,
1876
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δὲ ΝΞ ἴση κείσθω ἑκατέρα τῶν ΒΚ ΔΛ, καὶ ἐπιζευχθεῖ-
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σαι αἱ ΘΛ ΘΚ ἐκβεβλήσθωσαν καὶ συμπιπτέτωσαν ταῖς
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ΑΔ ΑΒ ἐκβληθείσαις κατὰ τὰ Π Ρ σημεῖα [ὅτι δὲ συμ-
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πίπτουσιν δῆλον· ἀπ' ἐλαττόνων γάρ εἰσιν δύο ὀρθῶν καὶ
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αὐταὶ κἀκεῖναι]· ἔσται δὴ τὸ ΘΚΛ ἐπίπεδον κεκλιμένον
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πρὸς τὸ ΑΒΓΔ ἐν τῇ ὑπὸ ΘΓΑ, τουτέστιν τῇ ὑπὸ ΕΖΗ.
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<
s
id
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">ἐὰν γὰρ νοήσωμεν τῇ ΑΘ παράλληλον ἠγμένην τὴν ΜΟ, καὶ
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ἐπεζευγμένην τὴν ΟΚ, ἔσται ἡ μὲν ΜΟ ἴση τῇ ΝΞ διὰ τὸ
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8
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ἰσογώνιον εἶναι τὸ ΖΝΞ τρίγωνον τῷ ΜΟΓ, ἡ δὲ ΚΟ τῇ
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ΒΜ ἴση καὶ παράλληλος, καὶ παραλληλόγραμμον τὸ ΚΒΜΟ
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ὀρθὸν πρὸς ὑποκείμενον. </
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<
s
id
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id.000101
">καὶ ἐπεὶ τὰ Π Γ Ρ σημεῖα ἐν
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δυσὶν ἅμα ἐπιπέδοις ἐστὶν τῷ τε ὑποκειμένῳ ΑΒΓΔ [ἐν
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ᾧ ἐστιν καὶ τὰ Π Ρ σημεῖα, ἀλλὰ] καὶ ἐν τῷ ΚΘΛΓ, τὰ
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Π Γ Ρ ἄρα σημεῖα ἐπὶ μιᾶς ἐστιν εὐθείας τῆς ΠΓΡ, κοι-
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νῆς τομῆς οὔσης τῶν εἰρημένων ἐπιπέδων. </
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<
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id
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id.000102
">διὰ ταὐτὰ δὴ
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καὶ τὰ Κ Ο Λ σημεῖα ἐπὶ τῆς κοινῆς ἐστι τομῆς τοῦ ΚΘΛΓ
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ἐπιπέδου καὶ τοῦ διὰ τῶν Κ Ο Λ παραλλήλου τῷ ΑΒΓΔ
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ἐπιπέδῳ, ὥστε τὴν διὰ τῶν Κ Ο Λ εὐθεῖαν παράλληλον
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εἶναι τῇ ΠΡ. </
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<
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id.000103
">ἐπεὶ οὖν ἐστιν ὡς μὲν ἡ ΑΠ πρὸς ΠΔ, ἡ
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ΘΑ πρὸς ΛΔ, ὡς δὲ ἡ ΑΡ πρὸς ΡΒ, ἡ ΑΘ πρὸς ΒΚ,
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καὶ ἴση ἐστὶν ἡ ΔΛ τῇ ΒΚ, ἴση ἄρα καὶ ἡ ΑΠ τῇ ΑΡ
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καὶ γωνία ἡ ὑπὸ ΑΠΡ τῇ ὑπὸ ΑΡΠ. </
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<
s
id
="
id.000104
">ἔστιν δὲ καὶ ἡ ὑπὸ
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22
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ΠΑΓ ἴση τῇ ὑπὸ ΡΑΓ· λοιπὴ ἄρα ἡ ὑπὸ ΑΓΠ τῇ ὑπὸ
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ΑΓΡ· ὀρθὴ ἄρα ἐστὶν ἑκατέρα αὐτῶν, καὶ ἡ ΠΡ εὐθεῖα
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δίχα τε καὶ πρὸς ὀρθὰς τέμνεται ὑπὸ τῆς ΑΓ. </
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<
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id
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id.000105
">καὶ ἔστιν
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</
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