The constructive triangles are used to demonstrate that all plane geometric figures can be constructed from triangles.
There are five cards
2 rectangular, 1 triangular, and 1 large and 1 small hexagonal.
Each card contains triangles of different sizes, shapes, and colors.
With the exception of Rectangular Box 2, black guidelines are painted in different positions on the triangles to help the child to construct other figures.
This should be encouraged as an exploratory work that will provide a foundation for later concepts of equivalency, similarity, and congruency.