¹⁶⁸contentum A    contentum rectangulum S
¹⁶⁹sint A   om. S
¹⁷⁰nxhopr, csf A   nxhor, cf S
¹⁷¹xamet ex amet A
¹⁷² A   rectangulum S
¹⁷³sicut mox ostendetur in scholio A   (sicut mox ostendetur in scholio) S
¹⁷⁴[[... huius]] signo posito in marg. A   per 12 huius S
¹⁷⁵ A   ad rectangulum S
¹⁷⁶sicut A   ut trapetium S
¹⁷⁷ A   ad rectangulum S
¹⁷⁸ A   ad rectangulum S
¹⁷⁹ A   rectangulum S
¹⁸⁰ signum mihi incognitum A   c. S