12. Ad prop. LV. Ἄλλως.
ἐστὶ τοῦ ΛΝ πρὸς τὸ ΜΟ δοθείς. δοθὲν δὲ τὸ ΛΝ τῷ μεγέθει· δοθὲν ἄρα καὶ τὸ ΜΟ τῷ μεγέθει. καί ἐστι τετράγωνον τὸ ἀπὸ τῆς ΜΝ· δοθὲν ἄρα ἐστὶ τὸ ἀπὸ τῆς ΜΝ· δοθεῖσα ἄρα ἐστὶν ἡ ΜΝ τῷ μεγέθει. διά τὰ αὐτὰ δὴ καὶ ἑκάστη τῶν ΜΛ, ΛΚ, KΞ, ΞΝ
δοθεῖσά ἐστι τῷ μεγέθει.
Data (demonstrationes alterae). Euclid. ed. Johan Ludvig Heiberg, ed. Heinrich Menge. United States. 2016.
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