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Constructive Triangles The Constructive Triangles give the child practical experience in plane geometry. The set consists of: 2 rectangular boxes, 1 triangular box, 1 small hexagonal box, and 1 large hexagonal box, each containing triangles of differing size, shape and color. Nienhuis Item Number: 004900 The printed notes of this Montessori presentation from our CME Teacher Preparation Course are available for purchase from this web page. Please search for: Constructive Triangles Exercises.