Combine a square and a triangle to draw a simple house shape, and tell the two shapes apart.
A square has four sides that are all the same length, and four corners. A triangle has three sides and three corners.
Put a triangle on top of a square and you get a house shape. The square is the walls, and the triangle is the roof.
Mastery looks like: They draw a square and a triangle correctly and combine them into a house shape.
Common stumbles: Drawing a square with only three sides, or a triangle with four, from rushing the corners.