Similar Triangles

Are they similar? The lesson provides an explanation of the angle-angle criterion for triangle similarity. Several problems allow the class to determine whether the two triangles with the given angle measures are similar or not. 

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CCSS: Designed
Additional Tags
Instructional Ideas
  • Have the class investigate the angle measurements of similar triangles
  • Use the video as homework to introduce the concept of determining similar triangles
Classroom Considerations
  • Pupils should know that dilations do not change the measure of angles
  • The lesson is ninth in an 11-part unit on congruence and similarity
  • Problems require the determination of the third angle to be able to conclude whether the triangles are similar
  • The video provides additional examples that are not in the handout
  • Resource only uses direct instruction to teach the material
Common Core