Similar Triangles

This Similar Triangles lesson plan also includes:

Pupils work in pairs to investigate what it takes to prove that two triangles are similar. They work through various shortcuts to find which are enough to show a similarity relationship between the triangles. Small groups work with the triangles formed when connecting the midpoints of the sides of a triangle.

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CCSS: Adaptable
Instructional Ideas

  • Provide several opportunities for pairs to discover relationships with similar triangles using geometry software
  • Have groups try to find other similarity shortcuts
Classroom Considerations

  • Class members should be familiar with congruent triangles
  • Uses geometry software, so be sure this is installed or accessible
  • This resource is only available on an unencrypted HTTP website. It should be fine for general use, but don’t use it to share any personally identifiable information

  • Includes suggested assessment questions
  • Contains an instructor reference sheet for activity three

  • None