[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. 1 2 3 4 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.
ὡς τὴν ΒΓ πρὸς τὴν ΓΚ, τὴν ΘΖ πρὸς τὴν ΖΚ. 1 2 3 4 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.
Scholia in opticorum recensionem Theonis (scholia vetera). Scholia in Euclidem. ed. Johan Ludvig Heiberg, ed. H. Menge. United States. 2018.
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