Unit one is about using tools to explain the congruence within and between polygons, focusing on triangles and regular polygons. Students will strategically use a variety of tools, including constructions and transformations, to justify the congruent relationships of sides, angles, and polygons. Developing fluency in construction is NOT an end in and of itself—it must connect to conceptual understanding.

Essential Questions:

- What does it mean for geometric figures to be congruent?
- How are constructions and transformations used to understand and be more precise about congruence?
- How are constructions used to understand and be more precise about rigid motion transformations?