Lesson Plan

Similarity and the Angle Bisector Theorem

Curated and Reviewed by Lesson Planet

Identifying and verifying reproducible patterns in mathematics is an essential skill. Mathematicians identify the relationship of sides when an angle is bisected in a triangle. Once the pupils determine the relationship, they prove it to be true for all triangles. They then apply the concept by finding missing side lengths.

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CCSS: Designed
Additional Tags
Instructional Ideas
  • Begin the lesson with a construction of an angle bisector in a triangle; have groups measure segments and make comparisons
  • Use examples as a collaborative activity and record work and answers on the board
Classroom Considerations
  • Learners should be proficient in creating and solving proportions and familiar with two-variable equations
Pros
  • Uses more advanced proportions, including those with two variables
  • Includes a review of essential skills as an opening activity
Cons
  • None