Point, segment and triangle constructions with circled figures
Three views of a basic construction and five figures of circles
The folio repeats one elementary construction in three views: a point a set beside a line segment b–c, then joined to it, and finally completed into a triangle by adding a fourth point d joined to points a and c. Along the margins a column of circle figures—captioned "Cinque figure di cerchi" (five figures of circles)—shows triangles and radial segments inscribed within pairs of concentric circles. These are Euclidean geometry exercises typical of Notebook M.
On this page
A point joined to a segment to form a triangle
A point a is drawn beside a line segment whose ends are labeled b and c. In the second view the point is joined to the segment by a further line; in the third a fourth point d is added and joined to a and c, completing a triangle.
Five figures of circles
A column of figures shows a smaller circle inscribed within a larger, with combinations of segments and points inside the smaller circle, and further circles carrying triangles built upon various radii and points. The caption calls them five figures of circles.