This assessment builds on and extends the content of the chapter. Students are guided through a process to find the number of trapezoids (of different size) in a series of nested equilateral triangles. Such nested triangles usually appear in mathematical puzzles, asking for the number of triangles that appear in them. However, counting the number of trapezoids might reveal a completely different number patter.

Math Concepts:
triangles
trapezoids
patterns
triangular numbers

MYP Related Concepts:
patterns
systems

MYP Key Concepts:
form
relationships

MYP Global Context:
Orientation in Space and Time