Parallelogram decomposed into triangles and rectangles
Two groups of triangles between parallels; g c a multiple of b c
A parallelogram is decomposed into triangles and rectangles, and two groups of triangles are ranged between parallel lines. The figures are lettered and numbered first through fourth (a–first–c b h g–third; d–second–m f e–fourth), and Leonardo notes that g c is a multiple of b c. The demonstration continues the notebook's equal-area constructions after Euclid.
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Parallelogram decomposed into triangles and rectangles
A parallelogram is broken down into constituent triangles and rectangles, part of the study of transforming and comparing areas.
Two groups of triangles between parallel lines
Two groups of triangles stand between parallel lines, lettered and numbered first through fourth (a–first–c b h g–third; d–second–m f e–fourth). Leonardo notes that g c is a multiple of b c.