In the process of understanding triangles, it is extremely important for the young children to understand not just their names from Casa but the universality of these names and what they mean. It can be very difficult for the child to take the Box of Sticks and make the six types of triangles. BW worked and worked on triangles to make his own examples.
“Can you make a triangle with 2 obtuse angles?”
“Make an equilateral triangle with a right angle?”