# Triangle Congruency Proofs (part 1)

##### This Triangle Congruency Proofs (part 1) lesson plan also includes:

Can they put it all together? Ninth graders apply what they know about proofs and triangle congruence to complete these proofs. These proofs go beyond the basic triangle congruence proofs and use various properties, theorems, and postulates.

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CCSS: Designed

##### Instructional Ideas

• Assign groups to put a proof on the board for analysis
• Differentiate the lesson by providing the statements for some proofs and ask for the reasons to be completed, or by preparing envelop proofs for pupils to complete before attempting independently
##### Classroom Considerations

• Prepare for variations in reading levels with an efficient method for learners to check their proofs
• Individuals should be comfortable with basic triangle congruence proofs before attempting these proofs
##### Pros

• Critical thinking is expected to synthesize information learned prior to develop the provided proofs
##### Cons

• Guiding material is not provided