Montessori Geometry Nomenclature Cards and Books are used to help familiarize the child with naming the basic elements of geometry. The second series is called Study of the Line, and part 2 is Parts of a Line. Identifying these concepts is required for Geometry Unit 6:Geometry 1 Study of Lines Lesson Plans Montessori Manual Unit 6This set contains 3 and 4 part cards including a booklet page (where the term is written in by the child) in both print and cursive on the following terms: raylinel