Triangles are all about threes, and practicing proving postulates is a great way to get started. The first page of the instructional activity provides a brief introduction of the different properties and postulates. The remaining pages contain various types of proofs that investigate the congruence of different triangles. 

Concepts

congruent triangles, triangle properties, postulates, geometric proofs, proofs, two-column proofs

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Additional Tags

math

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Instructional Ideas

• Do several examples in class and save some for homework

Classroom Considerations

• The problems may not align with the current curriculum; therefore use the document version to edit the instructions or problems
• Presumes learners are familiar with solving proofs

Pros

• A well-organized worksheet that provides plenty of room to show all work
• Comes with a completely worked-out answer key

Cons

• None

Common Core

HSG-CO.B.7 HSG-CO.B.8 HSG-SRT.B.5