Q2, W3: October 29-November 2

TeacherKristin Andreason
Subject AreaGeometry Honors
Grade Level8
Week #Twelve
Unit of InstructionUnit 3: Similarity
Standard(s) Taught

MAFS. 912.G-SRT.1.2:  Given two figures, use the definition of similarity in terms of similarity transformations to decide if they are similar; explain using similarity transformations the meaning of similarity for triangles as the equality of all corresponding pairs of angles and the proportionality of all corresponding pairs of sides.

MAFS.912.G-SRT.1.3:  Use the properties of similarity transformations to establish the AA criterion for two triangles to be similar.

MAFS.912.G-SRT.2.4:  Prove theorems about triangles.

Learning Targets and Learning Criteria
  • Students will learn that similar triangles are a result of dilations and that similar triangles have congruent angles and proportional sides.
  • Students will understand the various similarity postulates that can be used to prove similar triangles.
  • Students will understand that when two angle measures are known (AA), the third angle measure is also known (Third Angle Theorem).
  • Students will learn how to find missing side lengths or angle measures or perimeters of triangles using rations, proportions, and scale factors.
  • Students will be able to distinguish between congruence and similarity theorems.
Classroom Activities


  • Students will take guided notes on Ratios and Proportions (p. 19 ISN)
  • Students will create a Triangle Similarity Graphic Organizer (p. 20 ISN)
  • Students will do some practice problems on proving triangles similar
  • Students will begin the Similar Triangles Scavenger Hunt


  • Students will continue working on the Similar Triangles Scavenger Hunt


  • Students will complete the Similar Triangles Scavenger Hunt
Assignments Due
  • Similar Triangles Scavenger Hunt due on Thursday/Friday November 1/2.
Additional Resources

All IEP and ESOL accommodations will be provided daily.