Similar Triangles

This is one lesson in a larger Unit Plan that introduces triangular relationships through the lens of building a treehouse with a variety of triangular characteristics.  It includes proofs, real world problems, constructions, a unit project, assessments, and more. Lesson 16, “Similar Triangles", reviews ratio and proportion and includes an investigation lesson that helps students discover the Theorems of Triangle Similarity.  Resource includes downloadable files including student worksheets.  The entire unit plan can be found hereThe last part of this lesson (Oh say can you see) is a portion of a Unit Project, however, it could be used as a stand alone assignment as well. The lesson includes a suggestion to help with differential instruction.

Standards & Objectives

Essential and guiding questions: 
  • What are the differences and similarities between congruence and similarity?
  • When is being similar “good enough”?

Lesson Variations

Blooms taxonomy level: 
Understanding

Helpful Hints

Materials:

  • Paper
  • ruler
  • protractor
  • calculator

References

Contributors: