A Feast of Proofs: Justifying Triangle Congruence

Reuben Benzel

What does it take to show that 2 triangles are congruent?

Grade Level
Geometry Mathematics
80 minutes **Note: You’ll want to have a day of notetaking before the 80 minutes IF you have a non-flipped, in person class.
Face-to-Face Hybrid Synchronous Online



Engages in investigations and asking questions without necessarily questioning the structural status quo. Delves into popular culture and provides explorations of powerful images. Tensions are recognized that may result in some discomfort.


Equitable Practices and Systems

Leading learning and knowledge sharing is mediated through equitable and inclusive dispositions and decision-making processes that promote the success of disenfranchised learners and communities.

Multiple Ways of Knowing and Doing

The knowledge and wisdom of the students, families, and communities are centered in content and materials to promote equitable and inclusive learning experiences.

Deep and Transformational Learning

The promotion of academic success and transformational ends through a rigorous and integrated process that honors learners and communities as cultural entities and works to change the world to be a more equitable and inclusive place.


Social Justice

Identity 4 - Students will express pride, confidence and healthy self-esteem without denying the value and dignity of other people.
Diversity 6 - Students will express comfort with people who are both similar to and different from them and engage respectfully with all people.


Empowered Learner 1a - Students articulate and set personal learning goals, develop strategies leveraging technology to achieve them and reflect on the learning process itself to improve learning outcomes.
Global Collaborator 7c - Students contribute constructively to project teams, assuming various roles and responsibilities to work effectively toward a common goal.


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