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. 

Concepts

similar triangles, similarity, triangles

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Additional Tags

math

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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

Common Core

8.G.A.5 MP3 MP8