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Similarity (Day 7)

Lesson Prep

Lesson Details

  • Duration: 50 minutes

  • Learning Goal: Give students individual time to practice and solidify understanding of similarity and preview our upcoming right triangle unit.

Prework

  • Make sure you have Chromebooks or some other class set of technology.

Answer Keys

Classwork

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

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