Three polygons with matched homologous sides
Corresponding sides tagged with the same sign, repeated outside the figures
A faint pencil sheet showing three polygons, each roughly a square capped by a triangle, whose corresponding sides are marked with matching signs. The same signs are repeated outside the figures to identify the homologous sides from one polygon to the next. The page carries the old number 20, and no running text beyond the figure caption was transcribed.
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Homologous sides of three polygons
Three polygons are drawn with their corresponding sides tagged by identical marks, and the marks are repeated outside the figures so the homologous sides can be matched across the polygons. It is a study of correspondence and similarity between figures.