- Walk students through the directions on how to use the technology.
- AAA Rule- if angles of a triangle are congruent to the corresponding angles of another triangle, then the
triangles are similar. - SAME AS: The AA Triangle Similarity Postulate except that it uses two angles and not three.
- Both are true and both work.
- Indirect measurement- provide students with a visual example of the two similar triangles and the proportions.
IV.AlternativeAssessment
- Alternative Assessment in this lesson is done through observation and through interacting with the students
during the activity.
Similarity by SSS and SAS
I.SectionObjectives
- Use SSS and SAS to determine whether triangles are similar.
- Apply SSS and SAS to solve problems about similar triangles.
II.MultipleIntelligences
- There are two great ways to differentiate this lesson included in the text. One is the technology integration
and one is the hands- on activity. - Here is how we can take the hands- on activity and expand it a bit to include an interactive part.
- Complete the hands- on activity as it has been written in the text.
- When finished, ask students to write a few observations that they have made into their notebooks.
- Then ask students to contribute their observations to a class discussion.
- Write all of the student observations on the board. Point out the SSS for Similar Triangles.
- SSS for Similar Triangles- if the lengths of the sides of the two triangles are proportional, the triangles are
similar. - SAS for Similar Triangles- use Cheryl’s examples to create your own example to illustrate the SAS for Similar
Triangles. - Intelligences- linguistic, logical- mathematical, visual- spatial, interpersonal
III.SpecialNeeds/Modifications
- Write the intention of the lesson on the board.
- Intention is to explore relationships between proportional side lengths and congruent angles of similar trian-
gles. - Review the directions for using the technology.
- Write the directions to the hands- on activity on the board.
IV.AlternativeAssessment
- Observe student work through the technology integration activity.
- Observe student work through the hands- on activity.
4.7. Similarity