Isosceles Triangle Proof

Isosceles means two sides are congruent. Given an isosceles triangles, pupils develop a geometric proof showing that the two base angles are congruent. 

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CCSS: Designed
Instructional Ideas

  • Conduct a mini lesson about the advantages of drawing auxiliary lines in proofs
  • Have classmates brainstorm different ways to show two angles are congruent
Classroom Considerations

  • The class should be familiar with proving triangles are congruent

  • Contains examples of individuals' work
  • Includes questions to gain further understanding of your class' thinking and knowledge

  • None
Common Core