Ancient Greek
Section 67
Scholia in Euclidem, Scholia in opticorum recensionem Theonis (scholia vetera) 67
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67. Πρὸς δὲ τὴν ΑΒ τυχοῦσαν p. 208, καὶ πρὸς αὐτὴν γὰρ ὀρθὰς ποιεῖν οὐ δύναται, ἐπειδή, ἐὰν εὐθεῖα δύο εὐθείαις τεμνούσαις ἀλλήλας πρὸς ὀρθὰς ἐπὶ τῆς κοινῆς τομῆς ἐπισταθῇ, καὶ τῷ διʼ αὐτῶν ἐπιπέδῳ πρὸς ὀρθάς ἐστιν· ὑπόκειται δὲ αὐτῷ μὴ οὖσα πρὸς ὀρθὰς ἐν τῷ λϚ΄.