HUG 3, ff. 017r-v, inc. EH, EK = b
Incipit:EH, EK = b
Diagram and algebra involving the trapezoid and the section of a cylinder; "pertinet ad innatantia". On f. 17v, calculations leading to 1.09,1.33, 1.62, and 1.67; diagram and algebra involving secants of a circle.