The instructor:

• Cuts from cardboard five triangles of the approximate measurements noted in the picture and labels them as indicated.
• Holds up Model A and asks a child to name the type of triangle.
• Repeats for Models C, E, G, and I.
• Continues to drill on the shapes while holding each triangle various ways.
• Tells children that Model E is an equilateral triangle. "Equi" means equal and "lateral" means side, hence an "equilateral triangle" is an acute triangle with equal sides.

The instructor holds up Model A and asks children:

• To draw it.
• To turn it into the cabin B.

The instructor repeats the process for:

• Model C and cabin D.
• Model E and cabin F.
• Model G and wigwam H.
• Model I and a cabin.