# Scholia in Euclidis optica (scholia vetera) 15

Scholia in Euclidem, Scholia in Euclidis optica (scholia vetera), Section 15. Ancient Greek.

Canonical: https://interlinea.aeterna-institute.org/library/greek/scholia-in-euclidem/scholia-in-euclidis-optica-scholia-vetera/15

15. Ἡ ΑΒ p. 10, ἡ ΑΒ οὐκ ἔστιν ἀκτίς, ἀλλὰ εὐθεῖα, ὡς ἀπό τινος σημείου τοῦ Α ἀγομένη ἐπὶ τὸ διὰ τῶν ∠Γ, ΕΖ ἐπίπεδον κάθετος. ὁμοίως καὶ ἡ ΑΡ οὐκ ἀκτίς ἐστιν, ἀλλὰ κάθετος εὐθεῖα ἐπὶ τὴν ΡΞ, οὐ μὴν καὶ πρὸς τὸ ἐπίπεδον κάθετος· ἡ γὰρ ΑΒ κάθετος ἦν πρὸς τὸ ὑποκείμενον ἐπίπεδον.

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Scholia in Euclidem, Scholia in Euclidis optica (scholia vetera), ed. Johan Ludvig Heiberg, H. 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.
License: CC BY-SA 4.0 (https://creativecommons.org/licenses/by-sa/4.0/). Source: https://thegreeklibrary.pages.lisn.upsaclay.fr/works/tlg5022.tlg003.local001/.