Parallelogram within a parallelogram; three joined parallelograms
Areas of parallelograms from their sides, with segments f 8, g 4, h 8
A pencil sheet of geometrical figures from the notebook's Euclidean study of areas. At the upper right a rectangle crossed by a diagonal shows a parallelogram inscribed within a parallelogram, marked 23; below it three joined parallelograms, marked 24, carry the figures 4, 8, 3, 12, 24 and 6 giving their sides and areas. Three separate segments are labelled f 8, g 4 and h 8. The strokes are faint pencil and further light construction lines are present.
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Parallelogram within a parallelogram, and three joined parallelograms
At the upper right a rectangle is crossed by a diagonal, forming a parallelogram inscribed within a parallelogram (marked 23). Below, three joined parallelograms (marked 24) carry the figures 4, 8, 3, 12, 24 and 6 along their sides, studying how the area of a parallelogram follows from its base and height.
Three segments marked f 8, g 4, h 8
Below the parallelograms three straight segments are labelled f 8, g 4 and h 8, recording lengths in the ratio 8 : 4 : 8. They tie the linear measures to the areas set out in the figures above.