ι΄.
Τὰ πλάγια μήκη ἀπὸ τῶν κυρτῶν ἐνόπτρων, καθάπερ ἐστὶν ἀληθῶς, καὶ φαίνεται.
ἔστω μῆκος τὸ Ε∠, ὄμμα δὲ τὸ Β, ἔνοπτρον δὲ κυρτὸν τὸ ΑΓ, ὄψεις δὲ ἀνακλώμεναι ἐπὶ τὰ Ε, ∠. τὰ δὲ ἄλλα τὰ αὐτά.
Catoptrica (recensio Theonis?). Euclid. ed. Johan Ludvig Heiberg, ed. Heinrich Menge. United States. 2018.
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