Lesson objective: Create and read charts that illustrate hierarchical relationships.

This lesson helps to build fluency with classification of two-dimensional figures. A flowchart is used here because it highlights the connected relationships of different categories and subcategories of shapes. This work develops students' understanding that figures may belong to categories and subcategories, thus we can classify figures in a hierarchy based on properties.

Students engage in Mathematical Practice 7 (look for and make use of structure) as they use and create organized structures for categories of shapes, to visualize the relationships between different plane figures.

**Key vocabulary:**

- category
- hierarchy
- properties
- subcategory