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This Similar Triangles handout also includes:
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
Concepts
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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
Pros
- 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
Cons
- Resource only uses direct instruction to teach the material