Learning Goal: Further develop understanding of how AA criterion relate to similarity and build proficiency with finding corresponding sides.

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Note

• Most of the materials for this lesson are from “Identifying Similar Triangles” created by MARS

Classwork

• Estimation – Square Fill
• Warm Up
• Unpack upcoming Concept Quiz
• Handout
• Practice

Answers

• Link to Answers

 Standards

• Common Core
  • HSG.SRT.A – Understand similarity in terms of similarity transformations
  • HSG.SRT.B.4 – Prove theorems about triangles. Theorems include: a line parallel to one side of a triangle divides the other two proportionally, and conversely; the Pythagorean Theorem proved using triangle similarity.
  • HSG.SRT.B.5 – Use congruence and similarity criteria for triangles to solve problems and to prove relationships in geometric figures.
• TEKS
  • G.7(A) – apply the definition of similarity in terms of a dilation to identify similar figures and their proportional sides and the congruent corresponding angles
  • G.7(B) – apply the Angle-Angle criterion to verify similar triangles and apply the proportionality of the corresponding sides to solve problems
  • G.8(A) – prove theorems about similar triangles, including the Triangle Proportionality theorem, and apply these theorems to solve problems