τοῦ ∠Ζ μεγέθους, ἐν δὲ τῷ ἐφεξῆς ὑποτίθεται τῆν ∠Ζ ἐλάσσονα τῆς ἐκ τοῦ κέντρου καὶ πάλιν δείκνυσί τὸ ΑΒ μέγεθος ἔλασσον τοῦ ∠Ζ μεγέθους.
Scholia in opticorum recensionem Theonis (scholia vetera). Scholia in Euclidem. ed. Johan Ludvig Heiberg, ed. H. Menge. United States. 2018.
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