Ancient Greek text
Όψιν εἶναι εὐθεῖαν, ἧς τὰ μέσα πάντα τοῖς ἄκροις ἐπιπροσθεῖ. Τὰ ὁρώμενα …
Euclidis Opera Omnia, Teubner, Leipzig, 1895
Euclid, Catoptrica (recensio Theonis?), ed. Johan Ludvig Heiberg, Heinrich Menge. Text: The Greek Library, from the Perseus Digital Library and other open sources, CC BY-SA 4.0. Changes: apostrophes normalised and the text divided into reading sections by Interlinea.
Texts from The Greek Library and the Perseus Digital Library, under CC BY-SA 4.0 and CC BY 4.0. Divided into reading sections by Interlinea.