With the Constructive Triangles, the child explores how triangles relate to and can be the building blocks of other plane figures. The Large Hexagonal Box relates obtuse-angled triangles to equilaterals, to quadrilaterals, and to the hexagon. This material provides practice at visualizing and manipulating straight-sided figures in new ways, ones that will be applicable when the child studies equivalence and area in Elementary. 

This material includes:

- 1 hexagonal box
- Assorted triangles