Similarity (Day 6)

Lesson Prep

Lesson Details

• Duration: 50 minutes

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

Prework

• Watch the embedded video above to see how to unpack the upcoming Concept Quiz

• Watch this video which includes a breakdown of the Partner A Partner B format.

Answer Keys

• Link to Answer Keys

Classwork

• Estimation – Square Fill

• Warm Up

• Unpack upcoming Concept Quiz

• Handout

• Practice

Credits

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

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