# Scholia in opticorum recensionem Theonis (scholia vetera) 25

Scholia in Euclidem, Scholia in opticorum recensionem Theonis (scholia vetera), Section 25. Ancient Greek.

Canonical: https://interlinea.aeterna-institute.org/library/greek/scholia-in-euclidem/scholia-in-opticorum-recensionem-theonis-scholia-vetera/25

25. Οὕτως ἡ ΓΚ p. 164, 25] διὰ τὸ ἰσογώνιον εἶναι τὸ ΒΓΚ τῷ ΘΖΚ καὶ ἔχειν ἀνάλογον τὰς πλευράς, ὡς τὴν ΒΓ πρὸς τὴν ΓΚ, τὴν ΘΖ πρὸς τὴν ΖΚ. ὥστε καὶ ἐναλλάξ, ὡς τὴν ΒΓ πρὸς τὴν ΘΖ, τὴν ΓΚ πρὸς τὴν ΖΚ. ἀλλʼ ὡς ἡ ΒΓ πρὸς τὴν ΘΖ, καὶ ἡ ∠Ζ πρὸς τὴν ΘΖ· ἴση γὰρ ἡ ∠Ζ τῇ ΒΓ. ὡς ἄρα ἡ ∠Ζ πρὸς τὴν ΘΖ, οὕτως ἡ ΓΚ πρὸς τὴν ΚΖ.

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Scholia in Euclidem, Scholia in opticorum recensionem Theonis (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.tlg004.local001/.