[19] 19. Δυνατὸν καί, ὡς ἔχει ἡ καταγραφή, προβῆναι τὴν δεῖξιν. ἐπειδὴ γὰρ ἀνωτέρα ἐστὶν ἡ ΒΑ τῆς ΒΓ ἐὰν γὰρ ἄνωθεν διὰ αὐτῶν ἀγάγωμεν κάθετον, τὰ κατὰ τῆς Β Α τὰ ἀνώτερά ἐστι τῆς καθέτου· τὸ ἀπὸ τῆς
ἀνωτέρας ὁρώμενον, ὅ ἐστι τὸ ∠, τὸ ἀνώτερόν ἐστιν.
ἀνωτέρας ὁρώμενον, ὅ ἐστι τὸ ∠, τὸ ἀνώτερόν ἐστιν.
Scholia in Euclidis catoptrica (scholia vetera). Scholia in Euclidem. ed. Johan Ludvig Heiberg, ed. H. Menge. United States. 2018.
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