- Students will use AAA and AA with indirect measurement to solve problems.
- Students will share their understanding in their written work.
- Students will explain their thinking in small groups.
IV.NotesonAssessment
- Assess each diagram to assess student understanding.
- Are the triangles similar?
- Are they labeled correctly?
- Was a proportion used to solve for the height of the tree?
- Then assess student writing.
- Is student thinking clear?
- Offer notes/feedback.
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.ProblemSolvingActivity-TriangleJeopardy
- To play this game, divide students into small groups.
- To prepare this game, use a set of index cards and write one of the ways to prove similarity among triangles
on each card. - You should have cards that say SSS, SAS, AA and AAA
- Be sure that you have several of each card and mix them up.
- Each student in the group takes a turn.
- The student selects a card.
- Then he/she must come up with an example that illustrates the way to prove similar triangles.
- Each team can have 1 helpful hint- that is from you, and 1 lifeline from their group.
- If the student completes the challenge correctly, the team receives a point.
- You can play this game for quite a while.
- Some variations can include scale factor or diagrams on the board and then the group needs to show how the
triangles are similar.
III.MeetingObjectives
- Students will use and apply the SSS and SAS when determining whether triangles are similar.
- Students will use and apply the SSS and SAS to solve problems about similar triangles.
- Students will explain their work verbally and through diagrams.
IV.NotesonAssessment
- Assessment comes through the process of the game.
- Because students work individually, you will have a really good idea of who understands about similar
triangles and who needs more assistance. - Provide coaching/feedback when necessary through “helpful hints.”
5.7. Similarity