54. Ἐλάσσων δὲ ἡ ΕΚ τῆς ΒΓ ἐκ τοῦ ἰσογώνιον εἶναι τὸ ∠ΑΓ
 τῷ ∠ΕΚ2) ἐκ τῆς κοινῆς γωνίας καὶ ἐκ τῶν ὀρθῶν διὰ τὸ παραλλήλους
 εἶναι τὴν ΕΚ καὶ τὴν ΒΓ. 1) Errore permutauit MΑ, ΛΑ et ΠΜ, ΒΛ. 2) Debuit dici: dimidium ∠ΕΚ. 52. V (q); eodem pertinet. 53. V (q) 54. V (q); pertine ad
 p. 336, 14 sq. 4. τῷ] corr. ex τό m. 1 V. 6. τῇ] τῆς V. κορυφήν κορυφῆς
 V. ΠΑΜ] ΠΑΝ V. 9. ΜΑ] corr. ex ΜΑ m. 2 V. 10. ΜΑ] ΜΛ V. 11 ΜΑ] ΜΛ V. 16. τοῦ
 Β τὸ Β V. 17 ταὐτά] ταυτα V.