Congruence and Rigid Motions
Using rigid motions to define and prove congruence between triangles and other polygons.
About This Topic
Using rigid motions to define and prove congruence between triangles and other polygons.
Key Questions
- What does it mean for two figures to be congruent?
- How can rigid motions prove triangle congruence?
- What are the SAS, ASA, and SSS criteria?
Active Learning Ideas
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Planning templates for Geometry
5E Model
The 5E Model structures lessons through five phases (Engage, Explore, Explain, Elaborate, and Evaluate), guiding students from curiosity to deep understanding through inquiry-based learning.
Unit PlannerMath Unit
Plan a multi-week math unit with conceptual coherence: from building number sense and procedural fluency to applying skills in context and developing mathematical reasoning across a connected sequence of lessons.
RubricMath Rubric
Build a math rubric that assesses problem-solving, mathematical reasoning, and communication alongside procedural accuracy, giving students feedback on how they think, not just whether they got the right answer.